The COMS Research Fair will be held during the first week of classes: Thursday, September 5th and Friday, September 6th, from Noon until 14:00 in the CS lounge and Traub Conference Room.
For full details, see the webpage - https://www.cs.columbia.edu/research-fair-fall-2024/
If you are invited to join a project for credits, the PI will let you know the section of the project course (COMS 3998 / COMS 4901/ COMS 6901) you will take and how many credits to add. This will depend on your student status (undergraduate or graduate) and the demands of the project.