Create an laundry list of topics for starters, then outline. 

• Construction and opening, Ed Steffani
• early titles for the velodrome
• asphalt era, concrete reconstruction in 1979
• Don Peterson era
• 2007 construction
• Championship/big events: 1972 Trials, Masters Nats, Testarossa VC, Breaking Away 
• People: Steffani, Peterson, Bohl, others…
• the broader Hellyer Park

Early Pictures

Some early pictures. 
Joe Atmore, from a Cupertino Bike Shop archive. https://www.facebook.com/groups/YesterdaysVelodromes/posts/900461873840289/
Mike Phelps on FB, https://www.facebook.com/groups/YesterdaysVelodromes/posts/831205210765956/

Track design drawings.
https://www.facebook.com/groups/289334681852931/posts/1021716061948119/
https://www.facebook.com/groups/289334681852931/posts/1014458279340564/

The Steffani Family

Here are a few FB posts by Terry Shaw that contain information about Paul, Ed and Mike Steffani.
Paul and Ed: https://www.facebook.com/groups/YesterdaysVelodromes/posts/1215344952351978/
Mike: https://www.facebook.com/groups/YesterdaysVelodromes/posts/900792620473881/
Mike mentioned but mostly Robert “Speedy” Gonzales, https://www.facebook.com/groups/289334681852931/posts/974019526717773/

Existing Hellyer History web page