Calendar
There once was a time when SSI was small enough for a single calendar, in the days before the rift. Now, there are 8, one for each team in SSI and a calendar devoted entirely to events (to rule them all and in the darkness bind them, so-to-speak). You can view them on the website, at https://stanfordssi.org/events, or add them to your personal calendar (iCal, Google Calendar, Outlook, etc.) with the .ics links provided here.
Teams:
Subscribing to Calendars
Whatever calendar app you use will give you the option to subcribe to an outside calendar using an ics file. The links above take you to an ics file for each subteam's calendar. These calendars are hosted on Outlook for a host of bureacratic reasons that aren't very pertinent to this page. Below you can find guidelines on how to add that ics file to the calendar app of your choosing.
Google Calendar
Download your desired ics file from the links above
Sometimes this process doesn't work the first time, not really sure why. Don't panic just try it again.