Phoenix, congrats on finishing your OP therapy.
I don't like leaving the house either, so I understand where you are coming from. I start by making sure I look presentable, then just get in the car and go for a drive with no particular destination in mind. I also try to keep the windows open for fresh air.Usually while I'm out I'll think of an errand to run, or a place I want to go and stay out longer than expected. If not, I count it a plus that I at least got out.
As far as the meeting: I go, but avoid making conversation. I stand around and let other people do the talking. Often I'll get drawn in by a subject being talked about. Lo and behold, I will have socialized a bit.