My only concern would be capturing useable Walla. As you need the perfect distance to get the useable sounds, otherwise specific words and phrases can reduce its usefulness. I live next to a dodgy pub in London and can capture some nice and aggressive Walla, funny Walla, and what sometimes seems to be full on riots.
Check out this recording I did a year or so back:
Two different recordings hard panned so you can separate them. The main issue I had was the specific words and phrases, trying to reduce them into a blurry Walla.
I guess like anything it's location right, or organising people to "perform" - I could probably do that, a BBQ without music for an hour or so should do it.
The glass library also interests me a lot.