The Date Decider uses a sophisticated algorithm to drive consensus among your guests.  It's a way to poll your guests so the host can find out what date and time is best for everyone. 

First the host offers up a few date and time options for the event, which are then sent to the guests. As guests respond, they indicate which options fit their schedule (these can be visible to all other guests). The algorithm will group guests together to drive consensus to the most popular date and time option. Finally, Punchbowl recommends the best date to the host.

To learn how to set up your own Date Decider, follow this link