Folks are still getting things organized, so this list will expand and get more detailed . . .
Massive action in London to celebrate diverse struggles against capitalism, exploitation, and destruction of the planet, preceded by a four-day gathering starting April 28th, including workshops, speakers, discussions, a bookfair, a film festival, Critical Mass, plans for a permanent social center, etc
Manchester and Sheffield are also organizing events.
New York City
May Day parade, including actions and celebration.
Action in downtown against capitalist targets; celebration and a picnic. email@example.com
After the city gets shut down on April 16 when the IMF and the World Bank are in town, DC will be ready for a cool May Day celebration including: music, food, speakers, workshops, tables from liberatory organizations, etc.
Marches and unified protest downtown, with actions, shut-downs and anti-capitalist carnival. Possible targets include major corporations, the Board of Trade, maybe the whole city.
Rally and march in Congo Park including an autonomous anarchist section.
May Day action and celebration.
Camp-out in the Everglades, labor video festival, parade/dance/cavort event, a speak-out and celebration to be held on pirate radio, and a workday to make puppets and other crafty displays.
May Day celebration.
Carnival against capitalism.