Michele Pinassi

If you want to show your meetup’s groups activities on you wordpress blog, here’s the widget right for you. 
Just get the API key from Meetup.com and choose which groups to show: you’re done !

WP-Meetup-Activity

WP-Meetup-Activity display your groups latest activities (discussions, photos...) and events in a sidebar widget

Brian Wendt

Meetup Venues allows you to list Meetup.com events associated to a venue. This plugin is useful for the venue’s 
website to display what is going on at their venue.
A caveat to this plugin; when groups/users post events they do not always use the existing venue. This results in there 
being more than one venue listed per real physical location. You may need to use a comma deliminated list for the 
venue_id attribute.

Meetup.com Venues

This plugin allows you to list Meetup.com events associated to a venue.

WP-Meetup-Activity vs Meetup.com Venues