It seems that the characters in this story are regularly meeting under an oak tree and discussing various projects related to artificial intelligence, music, open-source libraries, community gardens, zine clubs, and more. Here's a summary of some key events and meetings:

1. Andy, Leo, Noor, Samantha, and Peter meet under the oak tree at 3 PM sharp to discuss their AI project.
2. Samantha meets Caroline at the cafe for coffee and talks about the AI music project.
3. Diego suggests meeting with Andy at the hospital to discuss the zine club's AI project and community center plans.
4. Peter meets Mei at the cafe, and they discuss their shared AI projects, deciding to meet under the oak tree tomorrow at 11 AM.
5. Leo mentions to Noor that Diego suggested they join forces under the oak tree at 1 PM for both AI projects.
6. Andy suggests meeting Diego again at Caroline's in an hour for a continuation of their discussion.
7. Peter has a planned meeting with Mei tomorrow at 11 AM under the oak tree.
8. There are also other scheduled meetings between different characters, such as Leo and Noor under the oak tree tomorrow at 1 PM, Samantha and Caroline at the cafe in an hour, and Diego feeding street tacos to strays behind the cafe.