The new HBO series will be filmed at Warner Bros Studios in Leavesden.
The mayor says he wants to "position the town and the county as a premier filming destination".
The Harry Potter Tour in Hertfordshire is sponsoring guide dogs named after JK Rowling characters.
The stunt double who was paralysed during filming hopes his nomination can "influence change".
The hit movie was partly shot at the Warner Bros studios in Hertfordshire, using over 6,000 extras.
Plans to expand the studios in Leavesden, Hertfordshire, were approved by Watford Borough Council.
The Warner Bros facility in Hertfordshire wants to grow to meet the demands of the TV industry.
Councillors and an elected mayor are standing in Hertfordshire on 5 May.
The vegan-friendly cake weighs more than 15 stone and took 320 hours to create.
