Twestival: Twitter Community Mashup for Charity
“Twestival is organized 100% by volunteers around the world and 100% of the money raised from these events will go directly to support charity: water projects.” - http://www.charitywater.org/twestival/
Find your local Twestival and join the party! http://twestival.com/
Most importantly, donate! Many people have donated just $5.
