I went to a conference at 26 weeks and another one overseas at 28ish weeks, went to a wedding at 25 wks no worries (no dancing though). Another pregnant lady came for the ceremony then headed off which I thought was a good idea (she was 39 wks and the reception was on a boat).

Oh, and I found a fantastic stunning comfy dress at a shop in Melbourne which I used for all these occasions and more for only $95, I wore it also for our first night out without baby when I was still in hospital. PM me if you want to know where I bought it.