We didn't open any presents at our reception, but we had a wishing well also, so not many people brought gifts anyway. Some did though.
There was no particular purpose to not opening gifts aside from the fact that one bridesmaid had to be taken home shortly after the speaches because she was so trashed. Another had to leave because her partner was ill (not from drinking) and my other bridesmaid was too busy partying.
It was a good night.
