Beltane, Walpurgisnacht, or just a day off work tomorrow (not for me though, the preparations for the exhibition are keeping me busy), whatever you celebrate under the full moon tonight, enjoy it!
For me personally, the best time of the year starts now, spring has fully arrived and summer awaits, the next winter seems far away. For me it is a time of planning new journeys and sketching new work pieces. I will also follow some personal tradition of spring cleaning today (and probably tomorrow in the atelier as well). The hibernation is finally over. That is, what I celebrate.