The club are offering Season Card holders the chance to buy additional tickets for just £12 and £7 throughout the stadium.
That's a massive saving on the usual matchday prices and means a parent and child can watch the game together for under £20.
This offer will not be available to non-Season Card holders.
Chairman Steve Gibson hopes a big crowd against the Hornets will inspire the team to further success.
"This is a chance for Season Card holders to bring friends and family along to a game at a special price and get them behind the team, just as they themselves have been throughout the season," he said.
"Our Season Card holders are our strongest advocates. We're doing this in recognition of their tremendous support and we're also asking them to help us recruit more fans to help us.
"Hopefully a big crowd for this game will help push the team over the line for another vital win that will take us another step closer to achieving our ambitions."
Manager Tony Mowbray is hoping as many Season Card holders as possible take up the offer.
"We never take the support of our Season Card holders for granted," he said. "Every season they make a major financial investment in this club that allows us to plan financially for the future.
"This investment allows us to improve the squad and the fabric of the club. I know many Season Card holders have to make financial sacrifices to pay for their tickets and we deeply appreciate the loyalty they show us.
"I feel it is important for Season Card holders to know how much we appreciate what they do for this club.
"They show trust and faith in this football club that must be acknowledged and we value their support very highly."
Tickets for the Watford game are now on sale and can be bought either in person at the Riverside and Captain Cook Square ticket offices or 24 hours by phone on 0844 499 1234, or online here at mfc.co.uk.
The club has also announced that any Season Card holder who wishes to move seats for the fixture to sit with friends and family will be relocated free of charge by the ticket office. Requests for moves should be made either over the phone or over the counter.