children underground let out once a year

I’m 37 and remember a movie from when I was a kid (so in the 80’s) that was old (maybe 60’s or 70’s). I can’t remember the title, so here I am.

What I remember is children being kept underground, there were adults and they went to school etc, but never were allowed above ground, but once a year. I think they day then went out it rained. I can’t remember if it was some sort of post apocalypse movie or just some weird counter culture type deal.

It was in english, I watched a lot of pbs, uhf and whatever came over the antenna so I’m not sure if it was a British movie or American. Something makes me think the kids were running in the rain naked, but I’m not sure.

Help? 🙂

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