Ceremony follows the witty nonsense spoken by Touchstone. Hymen, the Greek God of Marriage enters (at line 97). Hymen could be splendidly dressed, possibly wearing white silk and a crown of roses (as the character does in the 1606 masque entitled Hymenaei written by Ben Jonson). However, the character could also be simply dressed as a minister.
More importantly, Rosalind and Celia enter; and they are no longer in disguise. Duke Senior, Orlando, and Phoebe would thus be startled by the transformation.
Hymen performs the wedding ceremony for the four couples – (1) Orlando and Rosalind, (2) Oliver and Celia, (3) Phoebe and Silvius, and (4) Touchstone and Audrey. And the wedding ends with a song.