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There is a calendar which will show upcoming speakers that you can subscribe to called PSYCH CAL Colloquium (cal_sc_psych_cal_colloquium@o365.stanford.edu). It is based in Outlook, but can be viewed through iCal (and probably other systems) as well.
If you want to view this calendar in iCal on a Mac, then after doing the above, you need to make sure that you have Exchange configured in “System Preferences” / “Internet Accounts” and Calendar checked. See here. Note that for mysterious reasons this doesn't always work - if anyone knows what the magic sauce is, let me (Justin) know and I'll post instructions here.