We just found out from our DJ (who is also doing our ceremony music) that after our ceremony concludes there will be about a thirty minute gap while they move the sound system into our reception space and get it running there. Before finding this out we had planned on moving right from our ceremony ending at 6:45, into first introduction with music and then announcing tables for dinner at 7pm. Now I am sort of floundering as to what to do with the gap, I don't want our guests to just be left milling around for half an hour, what do most people do to fill a gap like this?