Around this time of year, in historic northern-hemisphere European cultures, #Summer begins. This is part of why so many #holidays are recognized on/near 1 May in the Gregorian calendar.
The reason is the difference between a solely astronomical solar calendar, and an agricultural calendar. If you are a subsistence farmer, planting your food crops (largely different from the foods grown in those regions today) needed to be done by now.
Time to celebrate the end of that effort!