The Wedding Day

There are two 18th century plays by this title.

The Wedding Day by Henry Fielding

It was started as Fielding's third play, but it was not finished until years later and finally brought out on both the stage and in print after his theatrical career ended. After Fielding returned to London from the University of Leyden during the end of 1729, he brought with him a version of The Wedding-Day. It was refused by John Rich to be staged, and it was not produced until 1743 by David Garrick.

http://en.wikipedia.org/wiki/Henry_Fielding's_early_plays

The Wedding Day by Elizabeth Inchbald

First performed on 1 Nov 1794 at Drury Lane and published in 1794, printed for G. G. and J. Robinson [etc.] in London.

Inchbald, Elizabeth. The Wedding Day. Eds. Thomas C. Crochunis and Susan Hyon. British Women Playwrights around 1800. 15 June 2003.[1]