Formal:
* Rehearsal Dinner: This is the most traditional and formal term for a dinner event held the night before the wedding, usually hosted by the groom's family.
* Pre-Wedding Dinner: This is a more general term for a dinner event held before the wedding, regardless of who hosts it.
Informal:
* Bachelor/Bachelorette Party: This refers to separate parties thrown for the groom and bride respectively, often involving friends and activities related to their last night of freedom.
* Last Night of Freedom: This is a more informal way of referring to the night before the wedding, emphasizing the change in life that marriage brings.
* Pre-Wedding Celebration: This is a broader term that can encompass any kind of event held before the wedding, from a casual dinner to a large party.
Other options:
* Wedding Eve: This is a more poetic and romantic term for the night before the wedding.
* Farewell to Singlehood: This emphasizes the end of being single and the beginning of a new chapter.
Ultimately, the best term to use will depend on the specific event and the tone you want to convey.