Students and 'cool cats' who attended Borehamwood Grammar School in the 1960s will reunite this September.
Ex-pupils and staff will be able to drink, laugh and reminisce about their schooldays as they meet at the Cat and Fiddle pub in Radlett.
The event, for all students who began at school in 1964, will take place in the lower bar of the pub on Sunday September 7 from midday to 4pm.
Attendees will be celebrating the 50 years since they last met.
Organiser Nick Male said: "We felt that the fifty years since we met was worthy of celebration, as we were all cool cats back then, man."