It's a new month & the WikiTree Calendar has the latest links for monthly challenges, as well as some others that don't last all month, such as today's Saturday Sourcing Sprint. And don't miss the upcoming livecast with Aleš Trtnik, Data Base Errors Project Leader and WikiTree Team Member - the livecast starts at 3 EST (just over 2 hours from when this was posted).
edit - added Weekend Chat - couldn't leave out that fun forum!
yup. on the same link as the one given for the livecast: http://www.youtube.com/watch?v=-q7jFAWLSkU
See also this link: https://www.wikitree.com/wiki/LiveCasts