Wedding

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Old English weddung (see wed, -ing1).

wiktionary

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From Middle English wedding, weddynge, from Old English weddung(“betrothal, espousal”), equivalent to wed +‎ -ing. Cognate with Middle Dutch weddinghe.

Conversion of wedding(noun) to verb.

etymonline

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wedding (n.)

Old English weddung "state of being wed; pledge, betrothal; action of marrying," verbal noun from wed (v.). Meaning "nuptials, ceremony of marriage" is recorded from early 13c.; the usual Old English word for the ceremony was bridelope, literally "bridal run," in reference to conducting the bride to her new home. Wedding ring is from late 14c.; wedding cake is recorded from 1640s, as a style of architecture from 1879. Wedding dress is attested from 1779; wedding reception from 1856.