This week the Tues and Thurs afternoon drop-ins will be moved to 3-4pm. There will be no morning drop-ins on Thursday.
Additionally, starting next week Tues afternoon drop-ins will permanently be from 3-4pm. The rest of the drop-ins will remain on the normal schedule.
You can always double-check drop-in times on this page: http://www.cs.washington.edu/education/ugrad/current/