A total of 68 hand axes and other Stone Age tools have sold for more than £40,000 in Canterbury.
Part of Reculver Towers will be open to the public for guided tours until Sunday.
Samantha Rodger-Smith said delays in submitting his paperwork to a panel meant he lost his place.
The RNLI are urging beachgoers to know the dangers of using inflatable beach toys and dinghies.
The ban will come into force on a 14-mile stretch between Seasalter and Reculver from April.
