I run a meetup called @hackersfounders here in New York City and we've been using @Anyvite over the last four years. Would love to give this app a try for our next meetup.
@riaface - Love the simplicity (reminds me of @makeshift's Attending.io product cc @stef, @jongold, @choosenick) and voting focus.
Far too many times I've tried organizing events with friends via email/text/facebook/etc. It's sooo hard to coordinate schedules with people.
You should also check out a new mobile app, Nextt (http://getnextt.com) if you haven't already.
Polywork
Pivot
Product Hunt