I love this idea. I've organized many charity events in my home town and would suggest that you should target smaller 'on the ground' organizations vs giving to some huge international group where most of your donation will be absorbed prior to getting in the hands of the needy. I usually target local food banks or homeless assistance groups - as their need is immediate and even a little bit donated can be a big help. Thank you for doing this and making Steemit a very 'give back to the community' minded place. Cheers!