FAT chief Somyout Poompanmoung said the campaign was intended to inspire children to take up the sport.
The only catch is that each parent can only get one child in for free.
The competition begins on March 22, when Thailand play Gabon (7.30pm) after a game between the Slovak Republic and United Arab Emirates (4.30pm).
The losers meet in a third-placed playoff on March 25 (4.30pm) with the final immedia6tely afterwards (7.30pm).