This has been nagging away at the back of my mind for a few months now. On IRC earlier, I was talking to Rock Drum, and it finally seemed sensible to propose it. Since the OTRS workshop, a few different groups have said "wouldn't it be good if we had a _____ workshop at the WMUK offices?"
Only, why not bundle them all together and have an intensive one-day event of skill sharing. I had initially thought of proposing a sister projects day, but the idea of this would be to have sister projects and other stuff all bundled together with the idea of enabling existing Wikimedia volunteers to try new things, and to increase cross-project coordination (really, despite what you may have heard, Wikinewsies and Wikisourcers and Wiktionarians etc. don't bite).
I've put a page up on the wiki with the broad idea and some ideas for sessions. Feel free to throw more ideas on the wiki, even if they are a bit half-baked or not well thought out. If the event actually happens, we'd obviously have to determine a schedule.
https://uk.wikimedia.org/wiki/Wikimedia_skill_swap
Is anyone interested in this? What steps would we have to go through to make this a reality?