Sorry, no umbrellas that block the view of other festival goers. You wouldn’t want someone with an umbrella blocking your view either, right?
You can bring a small parasol as long as you are courteous to other festival goers. Parasols will not deflect water as an umbrella does. Most parasols are made of paper and a light wood such as bamboo, not metal, and water-resistant material. If it falls into the dimensions of 23" long / 32" wide opened it's good. Also must be non-metal stemmed handle and scoping pole. Lightweight wood such as bamboo is ok.