Yes, this had been a problem before, with another free weekend event. From what I remember, there isn't a solution for this so you have to wait till the free weekend is over before you can join any.
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It's still Open for another 5 days
So maybe you resync after the free weekend?
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P.A.M is currently in free weekend, during which it shows up on pretty much everyone's steam profile and says how many hours are left in the free weekend. During this time I cannot enter this raffle: http://www.steamgifts.com/giveaway/2qNF8/post-apocalyptic-mayhem since it thinks I own it.
Not sure if there is a way around it, just a heads up in case there is though.
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