Plenty of people can claim disdain for the overwhelming invite channels of Evite, Paperless Post, epic email chains and incessant text messages, so the new group-wrangling app GiddyUp! might offer a welcome simplification. The new service allows the user to make an event with as many optional details (time, location, etc) as they wish, then invite people in their contacts and manage RSVPs with a few taps.
Giddyup!