sounds like you're just projecting, honestly

look, people need some good-natured drinking, feasting and gift-exchanging during the depths of winter in order to not go mad or depressed from the bleakness of it all. you don't need that kind of stimulus during the summer months precisely because it's so nice anyway - it'd be like taking medicine when you're healthy.

either you're being deliberately obtuse about the whole thing for some inexplicable reason, or else you've got a serious deficiency in your understanding of social customs

Ironically, only some cultures that put ever so much effort into their Christmas celebrations even bother to have anything at all for Midsummer, which is the actual nice part of the year.

In the US, which seems pretty big on Christmas, we've got Independence Day in early July.