You might find the below overview map helpful. It also shows the facilities at Durham Regatta, and where you can buy tickets and enter the enclosure area.
Regatta Control is located adjacent to the Regatta Start. It opens at 07:00 daily and closes 30 minutes after racing concludes.
Whilst cycling on the riverbanks is permitted in 2021, anyone cycling alongside/pacing a crew could result in the disqualification of that crew.