We will be hosting our ceremony and reception at the same location so there will be no gap between them. However, we are hosting a 3-hour brunch reception that ends at 2:00pm. My parents have offered to host an after party of sorts at their home, which we have accepted. However, FI and I would like said after party to be much more casual and comfortable. We were thinking about leaving the reception at 1:45 and checking into our hotel, then taking an hour or so to change and have a bit of time to ourselves. We thought guests could possibly take that time to change into more casual attire as well. If we were to start the after party at 3 or 4 would this be a breach of "gap" etiquette?