October. Halloween. Let's discuss things that have gone horribly, terribly *wrong* in your experiences with Linux and F/OSS in general.
What happened, how did you deal with it, what did you learn?
Also, it's time for a key signing party (https://en.wikipedia.org/wiki/Key_signing_party). If that goes well, maybe a CryptoParty (https://en.wikipedia.org/wiki/CryptoParty) before the end of the year?