Midway between the spring equinox and the summer solstice is Belatane, when the dark half of the year ends and the light half begins. Some celebrate the spiritual. Some the social. For some Beltane stirs more earthy observations.
Happy Beltane! Today, astronomically speaking, is one of the four Cross-Quarter days, exactly midway between the solstices and equinoxes. To some people, that makes today the start of summer - after all, why would you begin the season that's supposed to be bright and hot on the day when the only direction to go is darker? (Yes, I know they say May 1 - the first site I linked to figures out the exact dates and times mathematically, so I'm more inclined to trust it).
A post-modern bestiary of quasi-traditional May Day characters from Edinburgh's Beltane Fire Society.