Nuptial (adjective) = of marriage or wedding.

• They have gone to buy the nuptial dresses for the bride.
• Nuptial happiness/day/promises/vows.
• Nuptial festivities.
• Moments of nuptial bliss.

Nuptials (noun) = wedding; marriage.

• They purchased costly dresses for their daughter’s nuptials.
• The nuptials between Jayakrishnan and Clara will be solemnised next week.
• She’s preoccupied with the planning of her nuptials.
• The royal nuptials are scheduled to take place on June 30.