Bottom line, unless its a very calm day, these things need to be staked down, so keep the stakes in the bag with the shelter!
Longer story at Grasslands a year ago (Mudlands), our shelter was badly mangled, so the event replaced it with a bigger, nicer one. At Grasslands this year, we get it out there and the stakes were no longer in the carrying case. Sure enough, wind knocks it on its side, folding a couple of poles where theyre not supposed to fold, and its shot before its first birthday.
Happy Ending - Grasslands once again replaced it with a brand new one, now in the shed in time for our next event.