We usually celebrate with friends or family by drinking and eating traditional swedish alcoholic drinks (like Snaps) and traditional swedish food (like pickled herring). We also raise a pole called Midsommarstång and dance around it, and play outdoor games.
@xoxojune thank you so much! finally someone replies to me hahah I guess most people of the country celebrate Midsommar? As a french person it seems really weird, I thought only old people celebrated it 😂