Since I tend to forget when most WordPress dev chats are or pick wrong time zones instead, I set up a small weekly schedule with weekly IRC chats: http://devwp.eu/chats/
I got the schedules from the Make blogs and listed them with custom post type entries in a calendar. The handy thing is that one can control the timezone listing with a UTC-relative GET argument (also, few time zones are listed at the top of the calendar that switch that automatically). For example, what I use in Bulgaria is http://devwp.eu/chats/?utc=+3 which triggers the events shifted towards my timing instead of UTC.
Even though I wrote that for the WordPress IRC chats and it’s not super flexible or finely crafted, I can see how this could be helpful for remote teams who have weekly routines with colleagues from all around the world. Therefore this is also available on GitHub.