1967 musical-comedy film starring Elvis Presley and Shelley Fabares (8)

I believe the answer is:

clambake

(Other definitions for clambake that I've seen before include "Picnic, American style" , "For outdoors" , "Outdoor gathering to eat seafood (US)" , "Picnic in America" , "eating by the sea" .)

I've seen this clue in The Mirror.

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