What would you call an interim period without cocktails, and is only 30 minutes long?
The ceremony is from 11:30-11:50ish, then guests will be in a separate room next door for light refreshments and non-alchoholic drinks, while the room is switched over from ceremony to reception. During this time, guests can sign the guest book if they would like, step outside to a pretty outdoor garden/gazebo with some neat sculptures, or stay in the room where there will be places for anyone to sit. It will only take about 15 minutes for the venue to switch around the ceremony room. At 12:15ish, the doors will reopen, and lunch will be served at 12:30.
Does this need to be called anything at all?