update lab logistic according to Stanford's schedule
update lab logistic according to Stanford's schedule


Former-commit-id: 95469e41c108f9efffdf82f7a76e1bd5720f0bad
Former-commit-id: 3aa63ba0e25c60e2327df23c4ec638ad2ef82f84
Former-commit-id: ce417375e4f99b71159a72d1beb50de2137c12db
StanfordHCI/cs247,StanfordHCI/cs247,StanfordHCI/cs247