Optimist
- 6/7 February 2021 : CANCELLED – IOCA Winter Championships at WPNSA (ranking event)
- 13/14 March 2021 : IOCA Spring Championships at WPNSA (ranking event)
- 30 April-3 May 2021 (4 days) : IOCA Selection Trials (Invitational) at WPNSA
- 1/2 May 2021: ETs
- 15/16 May 2021 : IOCA Early Summer Championships at Grafham Water
- 31st July – 6 August 2021 : IOCA Nationals at WPNSA
- 11/12 September 2021 : IOCA Late Summer Championships at Poole YC
- 16/17 October 2021 : IOCA End of Season Championship at Royal Torbay YC
- 20/21 November 2021 : IOCA Winter Championships at Rutland