The Gambling Hall is an optional side area in LISA: The Pointless, located right next to Stefan Kindchild. It is apparently a meeting area for the so-called "Central Powers", a group of important people who discuss what is currently going on with the gangs, the Infinity Franchise, etc. However, by the end of the discussion, nearly everyone except Joel and Alex get murdered. The corpse of Long Leg Lenny is not found, implying he may have survived.
It is advised to go through the meeting, as your party will be fully healed, Joel will become drunk, and you'll get a few bottles.