Brunch in Boston

Will be hosting a post wedding brunch in Boston (Back Bay) in October. There will be about 50 people attending. Looking to spend up to $20 per person, although less is better. Had planned on having it at Pizzaria Uno, but have not been able to confirm so thought I should start looking elsewhere.

Some people staying at the Commonwealth, others at the Hampton near MGH.

Any suggestions?

I feel bad that your thread is languishing, so I hope this current Chowhound thread about regular brunch places gets you started:
http://chowhound.chow.com/topics/916074

You’d still have to do some research about handling that number of people and the cost.
If you do some searches, be warned that Chowhound has some of the crappiest software ever. There is good data on that board, though, if you can find it.