The river cruise and touring specialist saw bookings almost double month-on-month and hit their highest level since March 2020.
River cruises accounted for the bulk of agent bookings, with Europe proving the most popular destination.
Stuart Milan, Riviera Travel’s channel director, said: "We want to thank the trade for such a successful day and are so grateful for their continued support.
"We are absolutely committed to collaborating with our agent partners, and have worked hard to maintain and develop our relationships both with high street and online retailers."
Milan said he and his team were "encouraged by this increasing demand", adding: "Our flexible booking promise is ideal for giving customers the reassurance they may need to go ahead and book a well-deserved break this year or in 2022."
Speaking in July, Milan told TTG about his plans to invest in Riviera’s agent relationships.