fferraiu

This plugin allows you to integrate your wordpress blog with the platform capabilities of meetup. 
This provides a widget that allows you to view a list of recent activities of your group meetup.

MeetupUserActivityWidget

Allows you to integrate your wordpress blog with the platform capabilities of meetup

zaheer01

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This plugin is integrated with buddy-press plugin so you must have buddy-press installed to install and active this plugin.
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The plugin is used to create events for every group individually, by using a simple form, from front-end or client side.
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Event created from front-end will display in dashboard as well as in front-end for the admin and the user.
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The users can attend event and attended users avatar will display below the event box and detail page.
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An event calendar is also available for every group individually where any user and see event dates.
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If someone want to display list of person who attend events he has to use below shortcode [attendees]
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If someone want to display start and end details of event he has to use below shortcode [eventdetail]
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Note: Both above shortcode can be used in single.php
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Watch Demo Video
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/AkpYb9HM3lU?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

BP Event Manager

Plug and Play Plugin Development. A person can create events for buddypress groups.

MeetupUserActivityWidget vs BP Event Manager