Banquet

google

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late 15th century: from French, diminutive of banc ‘bench’ (see bank1).

wiktionary

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From Middle English banket, from Middle French banquet, from Italian banchetto(“light repast between meals, snack eaten on a small bench”, literally “a small bench”), from banco(“bench”), from Lombardic *bank, *panch(“bench”), from Proto-Germanic *bankiz(“bench”). Akin to Old High German bank, banch(“bench”), Old English benċ(“bench”). More at bank, bench.

etymonline

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banquet (n.)

late 15c., "feast, sumptuous entertainment," from Old French banquet "feast," earlier simply "small bench," from Old Italian banchetto, diminutive of banco "bench," variant of banca "bench," which is from a Germanic source (see bench (n.)). Apparently originally "a snack eaten on a bench" (rather than at table), hence "a slight repast between meals;" if so, the meaning has entirely changed.

banquet (v.)

"to feast," c. 1500, from banquet (n.). Related: Banqueted; banqueting.