See map. 207 entrance is on the second floor around the corner from the North end of the Rideau Canal Atrium, in the prefunction corridor (RCN) leading to the Rideau Centre entrance. Go past the entrance to rooms 203 and 205.
During the main conference (Wed-Fri) this room will be largely (but not exclusively) assigned to human and social topics along with 206/208. The main co-located event here will be Forge on Sunday and Monday.