I know what you mean, if I don't plan and actually do it within a week then I forget about it and it never happens. Good luck with you fun events, keep it simple! I don't usually do anything that takes longer than 5 minutes to prep, then it doesn't feel like a waste of time when the kids aren't into it.

We also made wind chimes yesterday, which my older kids really liked. Just involves plastic cups, strings, beads, a couple jingle bells. Just google plastic cup wind chime if you're interested. It definitely was a time filler if your kids like working with beads, took quite awhile to string all the beads on.