ReMIX is an annual twist on the MIX conference that takes a small portion of the content presented at MIX and combines it with new content and local speakers for a variety of sites around the world. There are generally ReMIX events announced throughout the year starting shortly after the MIX conference is held in Las Vegas.
Here are a few that have been announced so far:
Atlanta, Georgia is hosting a ReMIX conference May 8th for the southeastern United States
Moscow is hosting ReMIX May 21st along with a DevConf WebCamp earlier in the week
Melbourne is hosting ReMIX during June 1st and 2nd
And of course you can always watch the online videos recorded from the original MIX conference.