The community of Sherborne in Dorset will be able to pay their respects to Andrew Simpson, who has been killed in an accident in America.
A Book of Condolence will be opened in the town on Friday.
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More than 150 boats are taking part in the World Pilot Gig Championships - the biggest in its 27 year history.
A minute's applause will take place during the Army-Navy rugby match in memory of Captain David Seath, who died during the marathon.
RNLI lifeguards will start patrolling beaches in the region this weekend as the 2016 summer season get underway.