In Sweden the last day of April is known as Valborgsmässoafton. It's celebrated with big bonfires, and in my family we usually get together and enjoy some cheese soup. Needless to say it has mostly pagan roots and I personally see it as a public display of Beltaine.
The Sun, king and consort to the goddess has returned. May life spring up and all our endeavours be fruitful.
Merry Beltaine & Glad Valborg!