Umbrellas should never be allowed in any venue...ever. Spend the $5 on a poncho, and everyone is happy. Plus, it's a lot less problematic to carry around. Most high school stadiums I've been to this year don't even allow them anymore. Not all have this policy, but most. I get where people are coming from, but there are not enough good reasons to allow umbrellas into venues. If it's a venue policy, then enforce it all the time. That being said, I did overhear a police officer at the Pitt game tell someone they could bring in their umbrella. Consistency is an issue.