Returning to the historic usages of the term 'rave', here's some examples from the1960s.
At the 'Shoreline Club' in Bognor Regis they were promoting 'All Nite Raves' in 1966. The club described itself as 'The only Beatscene on the South Coast' and had a 'Snuggery open all day free to members' (source: The Untamed)
From Sandown (1964 or '65, presumably on Isle of Wight), 'Rave, big new scene tonight' at 'Sandown Town Hall' (source: The Clique)
1965 'All Nite Rave, Midnight to 6 am' at Club Noreik, Tottenham High Road
(image from White Fang's Who site):
An advert from 1964 for Leo's Cavern Club at the Olympia Ballroom in Reading. Note that on October 13th they were promoting an 'R & B Rave'.
Source: Anyway, Anyhow, Anywhere: The Complete Chronicle of the Who 1958-1978 by Andrew Neill abd Matthew Kent (The High Numbers mentioned in the advert were The Who in an early incarnation)