Event was due to take place on 1 August
This year's Castletown Festival and Confetti Carnival, due to take place on August 1, has been cancelled.
Organisers say they made the decision due to the current coronavirus pandemic.
Festival Committee Chairman Rachael Keyes said "I know it will be a disappointment for many, especially the children, but the festival will be back bigger and better on August 7 2021".
Steam Packet urged to be more 'transparent' over Manxman issues
Nature of work keeping boat in dry dock goes unexplained
Government needs to 'break the cycle' of child poverty on Island
Committee report accepted by Tynwald in court's final sitting
Proportion on waiting lists likely higher than England
Manx Care aiming for 95% of patients to be seen within a year
Onchan Commissioners 'disappointed' at village post office closure
Vice Chair Scott Wilson says service was 'very important' for local community