add sipb50 via git

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--- a/index.mdwn
+++ b/index.mdwn
@@ -12,6 +12,8 @@ computers, and maybe [[get involved|join]].
 We have [meetings](https://stuff.mit.edu/afs/sipb/admin/minutes/) every Monday at 19:30.
 You can find out what's abuzz in the SIPB community at [Planet SIPB](https://sipb.mit.edu/planet).  We host a number of events, which are enumerated on our [[calendar]].
 
+<h2>Come to SIPB's 50th anniversary celebration 9/28 and 9/29. For more information see here: <a href="http://sipb50.mit.edu/">sipb50.mit.edu</a></h2>
+
 **If you want to get involved with SIPB / be part of the discussion please [join Mattermost](https://mattermost.xvm.mit.edu/signup_user_complete/?id=pnfpw5qkpjnxxrq319ynh94eke).**
 
 Come to our rush events!