I allowed people to give items to each other, fixed a bug where it would often say "I can't reach that" when interacting with things, started on colour filtering for a feature I'll talk about another day, and implemented the start of the dialogue system. The game now knows what you're allowed to say, both on an individual and group level - it presents a simple interface and you can tell it what you want to say - but I haven't made it actually play out the conversations yet.
Tomorrow I hope to finish the dialogue system and implement items that bring external elements into the game (e.g. books that can be read, little individual puzzles, etc.).