Jockeys will refuse to ride on Monday in protest at the new whipping laws.
The scheduled meetings at Plumpton, Pontefract and Windsor are now under threat due to the strike.
The new rules restrict jockeys to using their whips a maximum of seven times during a flat race and eight times during a jump race.
Yesterday jockey Richard Hughes gave up his riding licence after being penalised twice, while nine jockeys from the same race were handed suspensions on Wednesday.
