Meeting her friends in an uncomfortable situation

[mpolitt]

With 3 hours notice, I was told that a date with girlfriend would now include several of her work friends. I have never met any of them before. Their activities will now center around the birthday of one individual during a music show in a crowded bar. I have trouble hearing in these environments, and will likely not hear a word anyone says. As such I am afraid I will be alone much of the time as my girlfriend socializes. Any advice would be appreciated. Thank you.