Who decides when and where the closing will take place?
Category - Home Selling Questions - Moving for the Seller FAQ's
Most closings take place at the title company that did the title work. It's usually decided by your attorney but not always. The closing will take place on or before the closing date on the contract unless otherwise specified.
References
Courtesy of HomeOwners Advantage and link that to their entry in the wiki which is at HomeOwners Advantage