The mess hall on deck two of the USS Voyager was the crew's dining room, where Neelix turned the captain's private dining room into a galley and presided as cook and morale officer.
The room is first used as Neelix's kitchen in Phage, when Janeway discovers that he has taken over her private dining room without asking and filled it with pots and alien vegetables. With replicators rationed, she lets the arrangement stand.
From then on the mess hall is the social centre of the ship. Crew members eat Neelix's experimental cooking there, and it hosts celebrations such as Prixin and Kes's birthday, as well as concerts, diplomatic receptions and Neelix's own broadcast, A Briefing with Neelix.
The room is pressed into other service in emergencies, becoming a sickbay ward or refugee shelter. In Homestead the crew gather there to mark First Contact Day shortly before Neelix leaves.