In July, do what you like

The month May was named for the Greek goddess Maia, who was identified with the Roman era goddess of fertility, Bona Dea, whose festival was held in May. Conversely, the Roman poet Ovidprovides a second etymology, in which he says that the month of May is named for the maiores, Latin for « elders, » and that the following month (June) is named for the iuniores, or « young people ».

Mayovka, in the context of the late Russian Empire, was a picnic in the countryside or in a park in the early days of May, hence the name. Eventually, « mayovka » (specifically, « proletarian mayovka ») came to mean an illegal celebration of May 1 by revolutionary public, typically presented as an innocent picnic.

(Source : Wikipedia)