Shindig

google

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mid 19th century: probably from the nouns shin and dig, influenced later by shindy.

wiktionary

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Origin uncertain; perhaps an alteration of shindy, or from Scottish Gaelic sìnteag(“ jump, leap”).

etymonline

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shindig (n.)

"dance, party, lively gathering," 1871, probably from shindy "a spree, merrymaking" (1821), also "a game like hockey;" perhaps from shinty, name of a Scottish game akin to hockey (1771), earlier shinny (see shinny (n.)).