The meaning of the joy of a groom and a bride is the Creator and the Shechina [Divinity].
It is written in Ketubot “enjoying being a fool,” meaning that each one should pretend to be a fool, like the intellect that asserts that it is inappropriate to dance, and unbecoming to rejoice with the joy of a groom and a bride, since why should he care if the groom is marrying the bride?
However, Israel are responsible for one another, meaning that all of Israel are one quality. For this reason, each one should be happy that a part of him is gaining and enjoying now, for a part of him has received the complete correction.