who would I contact to talk to about a social hour for 100 guests for 1.5 hours from 5 - 6:30?

I would call and check. As long as your not wanting sitting space. The place could accommodate the 100 people if you take the patio into consideration. The patio does have some limited seating, but the main area does not.

Id call but itd be pretty tight for 100 people

If you are from Savannah then go there and speak.. Or.. Google fir phone number and call

Place too small for 100 people

Call