aussieskater, thanks. We are not considered a commercial website - we are not in the business of selling or promoting any products or services. I think we are covered, but there are starting to be many frivolous lawsuits being filed and it is considered prudent to "do your homework."
jjane45, any finished product presented to the public. And, you can only post your (or your child's) performance.
We will need to be careful about anything beyond singles, though. A basic rule of photography/videography is that you have the permission of everyone in your photo/video (doesn't include crowds of spectators, usually.) So, for example, consider a synchro team with one member being a forum member. The posting member would have to have written permission before posting the video, just as on YouTube or anywhere else. If one of the team says no, you are violating their rights to post it.