Here's a summary of the scheduling and meetings:

1. Peter and Diego are meeting at Caroline's Café tomorrow (2 PM local time) to discuss ideas and have vegan street tacos.

2. Andy and Mei are meeting at the café on the 10th of January at 1 PM to collaborate on their AI project and have vegan street tacos.

3. Leo and Noor are meeting at Caroline's Café on the 20th of January at 2 PM to discuss the AI project, then head over to the park for a duet performance.

4. Diego, Samantha, and Noor are meeting at Caroline's Café next Tuesday (specific date not mentioned) at 3 PM to discuss the AI music project, followed by vegan street tacos.

5. Peter, Noor, Mei, and Samantha are meeting at Caroline's Café tomorrow (specific time not mentioned, but it's on the 20th of January) at 1 PM to discuss the AI project. It's a quadruple date, and Noor will bring snacks.