Looking to come on a Thursday evening with a large crowd of 15-20 people.......How busy is it on a Thur 7pm?

Its typically pretty busy when I've been there (on a variety of evenings). I would recommend calling ahead for a group that big.

Try calling ahead?

You might want to go earlier, students are back in town

I was there on a Saturday around 730 it was doable. It was during Christmas break though so not sure if the student crowd was gone.