Steam Summer Adventure - Guest Pass ?

Interesting, looks like a bug. Like, you know, there's an app code for the Summer Sale, so technically Steam considers the Summer Sales a game, equal to any article they sell. Anyway, you should keep it, that's a collector - even if it's quite likely it will vanish soon.

Yeah, I got that message the first day of the sale...

well guys, u probably crafted the "puzzle" for the free game called "might&magic:duel of champions" happened to me too when i crafted it.

I've been getting that everytime I craft a badge since Day 1.

also another fun bugish type thing with the sale is that the winter sale in my badges page says play game now like it does when you can get card drops still for a game kind of funny

yep, just happened to me too, nothing in the inventory either