DD first party was 4, she is end of May, we had a Peppa Pig muddy puddles party. The weather obliged produced lots of puddles but didn't actually rain during party. We had party food undercover in the old tram. Virtually zero organisation, the kids jumped in puddles and played in playground and had party tea. All I did was invites and peppa pig cake - very simple. The lady at daycare said the kids were all raving about it afterwards. I suspect some of them are not allowed to jump in puddles that often and doing it with their friends they thought was fantastic (invite stated wear gumboots etc).