Boyfriend is turning 21 and wants to go to bars but I cant legally drink..

My boyfriend is turning 21 in two weeks and he wants to celebrate by drinking (obviously) his friends offered to take him out to a few bars and promised him it would be a "memorable b-day." He wants me to come, but the problem is I just turned 20 (hes a year older than me) so I wont be able to do anything except sit around, heck some bars don't even let you in if your not 21. I just found this out kind of last minute and I thought me and him would do something for his birthday but its not looking that way..
I mean I want him to go out and have a good time with his friends but at the same time I feel kind of left out and I really want to see him on his birthday too!
I told him that I didn't feel comfortable going to a bar because I'm not of age and I cannot drink with everyone and that I would just hang with some of my friends for the night while hes out w/ his guy fiends but he got upset about that idea.
What do you all think?
What should I do?