Is there a room for groups of 20 people?

Maybe outside, but call ahead first.

Probably best outside for a group of that size

I agree with Lori, I think you would have to sit outside with that many people. If you sat inside, there wouldn't be room for multiple tables to be pushed together, so you'd have to be separated.

I disagree. I think yes than can accommodate but it may be outside seating

No