Mary and others,
The meetup at the National Library of Medicine was was going to be boring when it was not broadly for the public and when no one was invited to it. Now that there is an editathon it would be fun for anyone who wanted to come, and I took out the "boring" warning a few days ago. Hilda is teasing me.
Yes, it would be awesome if you came. Thanks for your interest.
About your copyright questions -
1. I do not know the best practices. I can look with you but I think it is best to ask at the Commons Village Pump.
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http://commons.wikimedia.org/wiki/Commons:Village_pump>
I looked at these templates and would want to ask you some more questions to understand.
2. PD-self would work. CC-0 is considered to be best practice because not all countries accept public domain declarations. I do not think this matters much but I would use CC-0 tags if that was my intent. However - if your organization would like to retain the right to promote itself, then the most customary of the easiest-to-use licensing on Wikipedia is CC-BY, which would mean that anyone who reused the images would have to give your organization attribution. Note that CC-BY-SA is the most common imaging license on Wikipedia, but I find the "share alike" provision to be restrictive for reuse and almost no one understands it.
3. That table is generated from the WikiProject tags on the talk page, and those come with categories which one is not supposed to insert otherwise. Yes, you should talk to me about how project article counts work because it is a pain to learn anything on Wikipedia through reading the documentation and it is better to have voice chats with someone. There is almost no documentation on this anyway.
4. On Wikipedia the use of sorting categories for personal projects would not be allowed, but yes, I am using such categories on Commons and many other people do as well. We should talk about this. I recommend it in some situations and in other situations I do other things. There is no documentation on doing this.