Watertown’s Commander’s Mansion. Head to the historic Commander’s Mansion and network with people from Watertown businesses and other local groups at the After Hours event. The Watertown Business Coalition’s recent Coffee Connect drew nearly 50 people, and the group invites people to its next event on Thursday, March 5 from 5 to 8 p.m. at the Watertown Commander’s Mansion, 440 Talcott Avenue, Watertown (the Arsenal on the Charles). Network with others from the Watertown business community, enjoy appetizers and a cash bar, and hear about development and the Arsenal Corridor. The event is free.