Grassroots Mapping together with Shai Efrati and Hagit Keysar launched a balloon several times over the heads of more than 3000 people in the march for Palestinian Independence, in Jerusalem. The march went from west to east Jerusalem, Friday July, 15 2011. Taking inspiration from Vota Inteligente's recent balloon live-streaming of protests in Santiago Chile, and Natalie Jeremijenko's BIT Balloon documentation of the RNC protests in New York City in 2004.
You can read more about the protest here: http://www.en.justjlm.org/557
http://www.wired.com/culture/lifestyle/news/2004/08/64720, Bit Balloon, 2004
The completed stitched map is here: