Features? Roll call!...
Login to your Meetup account with Meetroll to see all your Meetup groups, their events, and who RSVPed (Yes or No) for each event.
Did someone show up without RSVPing? Were they even part of the Meetup group? No problem! Add Attendees to an event and save their name and photo.
Need to update attendance for a past event? No problem! Meetroll shows events for past 30 days.
Meetroll does not save attendance info on the Meetup.com site, but internally on your phone. If you want to sync attendance to your meetup site (ie if you are an Organizer) then you will need to sync them manually. This is due to technical limitations of Meetup's API.