I prefer to keep coins in-network as much as possible. If we contact the charities, it may be fun to trade for services on their behalf instead of just giving them away for exchange.
E.g., horizontality may need translation / web design, and we could post a bounty for someone to help them. Or, hire peace geeks to work with them. Or, organize MMC members to order bulk food for sean's outpost, etc. instead of just donating...
Seems like it still helps out the charities. Coins may still end up at exchange afterwards, but they go through at least one more community member first, right?
And, I'll always mention my favorite - BTC Oyate Project - we could try to get their attention.
Looking at itsik's list - Khan academy may also be good. I think they promote personal finance education...new cryptos are gonna need a lot of that...