diff --git a/app/soapbox/actions/events.ts b/app/soapbox/actions/events.ts
index f9417a6c0..6413fe268 100644
--- a/app/soapbox/actions/events.ts
+++ b/app/soapbox/actions/events.ts
@@ -35,9 +35,19 @@ const EVENT_SUBMIT_REQUEST = 'EVENT_SUBMIT_REQUEST';
 const EVENT_SUBMIT_SUCCESS = 'EVENT_SUBMIT_SUCCESS';
 const EVENT_SUBMIT_FAIL    = 'EVENT_SUBMIT_FAIL';
 
+const EVENT_JOIN_REQUEST = 'EVENT_JOIN_REQUEST';
+const EVENT_JOIN_SUCCESS = 'EVENT_JOIN_SUCCESS';
+const EVENT_JOIN_FAIL    = 'EVENT_JOIN_FAIL';
+
+const EVENT_LEAVE_REQUEST = 'EVENT_LEAVE_REQUEST';
+const EVENT_LEAVE_SUCCESS = 'EVENT_LEAVE_SUCCESS';
+const EVENT_LEAVE_FAIL    = 'EVENT_LEAVE_FAIL';
+
 const messages = defineMessages({
   exceededImageSizeLimit: { id: 'upload_error.image_size_limit', defaultMessage: 'Image exceeds the current file size limit ({limit})' },
   success: { id: 'create_event.submit_success', defaultMessage: 'Your event was created' },
+  joinSuccess: { id: 'join_event.success', defaultMessage: 'Joined the event' },
+  joinRequestSuccess: { id: 'join_event.request_success', defaultMessage: 'Requested to join the event' },
   view: { id: 'snackbar.view', defaultMessage: 'View' },
 });
 
@@ -191,8 +201,6 @@ const submitEvent = () =>
 
     dispatch(submitEventRequest());
 
-    const idempotencyKey = state.compose.idempotencyKey;
-
     const params: Record<string, any> = {
       name,
       status,
@@ -206,9 +214,9 @@ const submitEvent = () =>
 
     return api(getState).post('/api/v1/pleroma/events', params).then(({ data }) => {
       dispatch(closeModal('CREATE_EVENT'));
-      dispatch(importFetchedStatus(data, idempotencyKey));
+      dispatch(importFetchedStatus(data));
       dispatch(submitEventSuccess(data));
-      dispatch(snackbar.success(messages.success, messages.view, `/@${data.account.acct}/posts/${data.id}`));
+      dispatch(snackbar.success(messages.success, messages.view, `/@${data.account.acct}/events/${data.id}`));
     }).catch(function(error) {
       dispatch(submitEventFail(error));
     });
@@ -228,6 +236,71 @@ const submitEventFail = (error: AxiosError) => ({
   error: error,
 });
 
+const joinEvent = (id: string, participationMessage?: string) =>
+  (dispatch: AppDispatch, getState: () => RootState) => {
+    const status = getState().statuses.get(id);
+
+    if (!status || !status.event || status.event.join_state) return;
+
+    dispatch(joinEventRequest());
+
+    return api(getState).post(`/api/v1/pleroma/events/${id}/join`, { participationMessage }).then(({ data }) => {
+      dispatch(importFetchedStatus(data));
+      dispatch(joinEventSuccess(data));
+      dispatch(snackbar.success(
+        data.pleroma.event?.join_state === 'pending' ? messages.joinRequestSuccess : messages.joinSuccess,
+        messages.view,
+        `/@${data.account.acct}/events/${data.id}`,
+      ));
+    }).catch(function(error) {
+      dispatch(joinEventFail(error));
+    });
+  };
+
+const joinEventRequest = () => ({
+  type: EVENT_JOIN_REQUEST,
+});
+
+const joinEventSuccess = (status: APIEntity) => ({
+  type: EVENT_JOIN_SUCCESS,
+  status: status,
+});
+
+const joinEventFail = (error: AxiosError) => ({
+  type: EVENT_JOIN_FAIL,
+  error: error,
+});
+
+const leaveEvent = (id: string) =>
+  (dispatch: AppDispatch, getState: () => RootState) => {
+    const status = getState().statuses.get(id);
+
+    if (!status || !status.event || !status.event.join_state) return;
+
+    dispatch(leaveEventRequest());
+
+    return api(getState).post(`/api/v1/pleroma/events/${id}/leave`).then(({ data }) => {
+      dispatch(importFetchedStatus(data));
+      dispatch(leaveEventSuccess(data));
+    }).catch(function(error) {
+      dispatch(leaveEventFail(error));
+    });
+  };
+
+const leaveEventRequest = () => ({
+  type: EVENT_LEAVE_REQUEST,
+});
+
+const leaveEventSuccess = (status: APIEntity) => ({
+  type: EVENT_LEAVE_SUCCESS,
+  status: status,
+});
+
+const leaveEventFail = (error: AxiosError) => ({
+  type: EVENT_LEAVE_FAIL,
+  error: error,
+});
+
 export {
   LOCATION_SEARCH_REQUEST,
   LOCATION_SEARCH_SUCCESS,
@@ -247,6 +320,12 @@ export {
   EVENT_SUBMIT_REQUEST,
   EVENT_SUBMIT_SUCCESS,
   EVENT_SUBMIT_FAIL,
+  EVENT_JOIN_REQUEST,
+  EVENT_JOIN_SUCCESS,
+  EVENT_JOIN_FAIL,
+  EVENT_LEAVE_REQUEST,
+  EVENT_LEAVE_SUCCESS,
+  EVENT_LEAVE_FAIL,
   locationSearch,
   changeCreateEventName,
   changeCreateEventDescription,
@@ -265,4 +344,12 @@ export {
   submitEventRequest,
   submitEventSuccess,
   submitEventFail,
+  joinEvent,
+  joinEventRequest,
+  joinEventSuccess,
+  joinEventFail,
+  leaveEvent,
+  leaveEventRequest,
+  leaveEventSuccess,
+  leaveEventFail,
 };
diff --git a/app/soapbox/components/event-preview.tsx b/app/soapbox/components/event-preview.tsx
index bf9ef4353..e1da5af62 100644
--- a/app/soapbox/components/event-preview.tsx
+++ b/app/soapbox/components/event-preview.tsx
@@ -1,7 +1,10 @@
 import React, { useCallback } from 'react';
-import { FormattedDate, FormattedMessage } from 'react-intl';
+import { defineMessages, FormattedDate, FormattedMessage, useIntl } from 'react-intl';
 
-import { useAppSelector } from 'soapbox/hooks';
+import { joinEvent, leaveEvent } from 'soapbox/actions/events';
+import { openModal } from 'soapbox/actions/modals';
+import { buildStatus } from 'soapbox/features/scheduled_statuses/builder';
+import { useAppDispatch, useAppSelector } from 'soapbox/hooks';
 
 import Icon from './icon';
 import { Button, HStack, Stack, Text } from './ui';
@@ -9,11 +12,19 @@ import VerificationBadge from './verification_badge';
 
 import type { Account as AccountEntity, Status as StatusEntity } from 'soapbox/types/entities';
 
+const messages = defineMessages({
+  leaveConfirm: { id: 'confirmations.leave_event.confirm', defaultMessage: 'Leave event' },
+  leaveMessage: { id: 'confirmations.leave_event.message', defaultMessage: 'If you want to rejoin the event, the request will be manually reviewed again. Are you sure you want to proceed?' },
+});
+
 interface IEventPreview {
   status: StatusEntity,
 }
 
 const EventPreview: React.FC<IEventPreview> = ({ status }) => {
+  const intl = useIntl();
+  const dispatch = useAppDispatch();
+
   const me = useAppSelector((state) => state.me);
 
   const account = status.account as AccountEntity;
@@ -21,6 +32,32 @@ const EventPreview: React.FC<IEventPreview> = ({ status }) => {
 
   const banner = status.media_attachments?.find(({ description }) => description === 'Banner');
 
+  const handleJoin: React.EventHandler<React.MouseEvent> = (e) => {
+    e.preventDefault();
+
+    if (event.join_mode === 'free') {
+      dispatch(joinEvent(status.id));
+    } else {
+      dispatch(openModal('JOIN_EVENT', {
+        statusId: status.id,
+      }));
+    }
+  };
+
+  const handleLeave: React.EventHandler<React.MouseEvent> = (e) => {
+    e.preventDefault();
+
+    if (event.join_mode === 'restricted') {
+      dispatch(openModal('CONFIRM', {
+        message: intl.formatMessage(messages.leaveMessage),
+        confirm: intl.formatMessage(messages.leaveConfirm),
+        onConfirm: () => dispatch(leaveEvent(status.id)),
+      }));
+    } else {
+      dispatch(leaveEvent(status.id));
+    }
+  };
+
   const renderDate = useCallback(() => {
     if (!event.start_time) return null;
 
@@ -64,6 +101,43 @@ const EventPreview: React.FC<IEventPreview> = ({ status }) => {
     );
   }, [event.start_time, event.end_time]);
 
+  const renderAction = useCallback(() => {
+    let buttonLabel;
+    let buttonIcon;
+    let buttonDisabled = false;
+    let buttonAction = handleLeave;
+
+    switch (event.join_state) {
+      case 'accept':
+        buttonLabel = <FormattedMessage id='event.join_state.accept' defaultMessage='Going' />;
+        buttonIcon = require('@tabler/icons/check.svg');
+        break;
+      case 'pending':
+        buttonLabel = <FormattedMessage id='event.join_state.pending' defaultMessage='Pending' />;
+        break;
+      case 'reject':
+        buttonLabel = <FormattedMessage id='event.join_state.rejected' defaultMessage='Going' />;
+        buttonIcon = require('@tabler/icons/ban.svg');
+        buttonDisabled = true;
+        break;
+      default:
+        buttonLabel = <FormattedMessage id='event.join_state.empty' defaultMessage='Participate' />;
+        buttonAction = handleJoin;
+    }
+
+    return (
+      <Button
+        size='sm'
+        theme='secondary'
+        icon={buttonIcon}
+        onClick={buttonAction}
+        disabled={buttonDisabled}
+      >
+        {buttonLabel}
+      </Button>
+    );
+  }, [event.join_state]);
+
   return (
     <div className='rounded-lg bg-gray-100 dark:bg-primary-800 shadow-xl relative overflow-hidden'>
       <div className='absolute top-28 right-3'>
@@ -75,22 +149,7 @@ const EventPreview: React.FC<IEventPreview> = ({ status }) => {
           >
             <FormattedMessage id='event.manage' defaultMessage='Manage' />
           </Button>
-        ) : event.join_state === 'accept' ? (
-          <Button
-            size='sm'
-            theme='secondary'
-            icon={require('@tabler/icons/check.svg')}
-          >
-            <FormattedMessage id='event.join_state.accept' defaultMessage='Going' />
-          </Button>
-        ) : (
-          <Button
-            size='sm'
-            theme='primary'
-          >
-            <FormattedMessage id='event.join_state.empty' defaultMessage='Participate' />
-          </Button>
-        )}
+        ) : renderAction()}
       </div>
       <div className='bg-primary-200 dark:bg-gray-600 h-40'>
         {banner && <img className='h-full w-full object-cover' src={banner.url} alt={banner.url} />}
diff --git a/app/soapbox/features/ui/components/modal_root.js b/app/soapbox/features/ui/components/modal_root.js
index 050d705b6..0f7b8c025 100644
--- a/app/soapbox/features/ui/components/modal_root.js
+++ b/app/soapbox/features/ui/components/modal_root.js
@@ -33,6 +33,7 @@ import {
   VerifySmsModal,
   FamiliarFollowersModal,
   CreateEventModal,
+  JoinEventModal,
 } from 'soapbox/features/ui/util/async-components';
 
 import BundleContainer from '../containers/bundle_container';
@@ -71,6 +72,7 @@ const MODAL_COMPONENTS = {
   'VERIFY_SMS': VerifySmsModal,
   'FAMILIAR_FOLLOWERS': FamiliarFollowersModal,
   'CREATE_EVENT': CreateEventModal,
+  'JOIN_EVENT': JoinEventModal,
 };
 
 export default class ModalRoot extends React.PureComponent {
diff --git a/app/soapbox/features/ui/components/modals/join-event-modal.tsx b/app/soapbox/features/ui/components/modals/join-event-modal.tsx
new file mode 100644
index 000000000..c3a7743fa
--- /dev/null
+++ b/app/soapbox/features/ui/components/modals/join-event-modal.tsx
@@ -0,0 +1,71 @@
+import React, { useState } from 'react';
+import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
+
+import { joinEvent } from 'soapbox/actions/events';
+import { closeModal } from 'soapbox/actions/modals';
+import { Modal, Text } from 'soapbox/components/ui';
+import { useAppDispatch } from 'soapbox/hooks';
+
+const messages = defineMessages({
+  placeholder: { id: 'join_event.placeholder', defaultMessage: 'Message to organizer' },
+  join: { id: 'join_event.join', defaultMessage: 'Request join' },
+});
+
+interface IAccountNoteModal {
+  statusId: string,
+}
+
+const AccountNoteModal: React.FC<IAccountNoteModal> = ({ statusId }) => {
+  const intl = useIntl();
+  const dispatch = useAppDispatch();
+
+  const [participationMessage, setParticipationMessage] = useState('');
+  const [isSubmitting, setIsSubmitting] = useState(false);
+
+  const onClose = () => {
+    dispatch(closeModal('JOIN_EVENT'));
+  };
+
+  const handleChange: React.ChangeEventHandler<HTMLTextAreaElement> = e => {
+    setParticipationMessage(e.target.value);
+  };
+
+  const handleSubmit = () => {
+    setIsSubmitting(true);
+    dispatch(joinEvent(statusId, participationMessage))?.then(() => {
+      onClose();
+    }).catch(() => {});
+  };
+
+  const handleKeyDown: React.KeyboardEventHandler<HTMLTextAreaElement> = e => {
+    if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
+      handleSubmit();
+    }
+  };
+
+  return (
+    <Modal
+      title={<FormattedMessage id='join_event.title' defaultMessage='Join event' />}
+      onClose={onClose}
+      confirmationAction={handleSubmit}
+      confirmationText={intl.formatMessage(messages.join)}
+      confirmationDisabled={isSubmitting}
+    >
+      <Text theme='muted'>
+        <FormattedMessage id='join_event.hint' defaultMessage='You can tell the organizer why do you want to participate in this event:' />
+      </Text>
+
+      <textarea
+        className='setting-text light'
+        placeholder={intl.formatMessage(messages.placeholder)}
+        value={participationMessage}
+        onChange={handleChange}
+        onKeyDown={handleKeyDown}
+        disabled={isSubmitting}
+        autoFocus
+      />
+    </Modal>
+  );
+};
+
+export default AccountNoteModal;
diff --git a/app/soapbox/features/ui/util/async-components.ts b/app/soapbox/features/ui/util/async-components.ts
index 955137704..78353c3d8 100644
--- a/app/soapbox/features/ui/util/async-components.ts
+++ b/app/soapbox/features/ui/util/async-components.ts
@@ -529,3 +529,7 @@ export function AnnouncementsPanel() {
 export function CreateEventModal() {
   return import(/* webpackChunkName: "features/create_event_modal" */'../components/modals/create-event-modal/create-event-modal');
 }
+
+export function JoinEventModal() {
+  return import(/* webpackChunkName: "features/join_event_modal" */'../components/modals/join-event-modal');
+}