Related Clues:

• Head of regiment, say, attending army do at Henley
• Sponsor (eg, attaché) keeps this event afloat
• Boat race meeting
• Great at organised water-sports
• A target set out for meeting between banks
• The main event?
• Set a target for races at Henley
• Boat races
• Yachting gala
• Wet race-meeting
• Boat race-meeting
• Maritime event having at sea great set of volunteers
• For which a damp course is essential
• A target arranged for main sporting event
• Main competition?