How to measure the effectiveness of GiveBig and other “day of giving” campaigns?

Today, May 15, is GiveBig, Seattle’s third annual “day of giving” event. Created by the Seattle Foundation in 2011, the idea is to focus attention on charitable giving, raise the public profile of the Seattle Foundation and of course raise some dough. There are similar events in many other cities now, and even a national “GivingTuesday” event right after Thanksgiving.

But how do we know whether GiveBig and similar day of giving type events are really working?

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