Does anyone know if this park allows any birthday parties ? Or barbecues??

You can call the portland parks and recreation and they can answer your question

First come first serve unless you reserve. More details here: https://www.portlandoregon.gov/parks/38301

We have had plenty of partys there but theres no bbq pits like a county park. Hazelton on flavel drive still did last look but its no frills tiny place