Sounds like a good event,
But for example combining pillow fighting with a massive cleaning around the area that we're going to fight(as eka also mentioned about) and anouncing this event for example like " We fight to clean" or whatever, would take less attention and would be remembered as a good and harmless event as well. We should remember how our brains work, when people hear about the verb fighting the first thing come up in their mind would not be colorful things :) So we don't want to provocate everyone even if it is undelibaretly.
ps: Since I am in Istanbul I can send you a puppet of me that you can hit as much as you want so that I would feel as I am taking part in it :)
Cheers,
Ibo
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ibo ' 07