The team heads out to a nightclub for some relaxation only to have it be attacked by a new speedster in episode 2x16 "Trajectory".
Source: YVRShoots — Twitter
Oliver and Maseo go to recover Tatsu from a club run by China White in episode 3x11 "Midnight City".
Kovar hosts an event for many important members of the Russian government who he plans on killing in episode 5x17 "Kapiushon".
Clive and Liv head to the nightclub where the victim DJed and find the woman who slapped her at the supermarket in episode 3x06 "Some Like It Hot Mess".