Formal Events:
* Soirée: A formal evening gathering.
* Reception: A formal gathering, often held after a wedding or other event.
* Gala: A large, formal event, often for a charitable cause.
* Ball: A formal dance, often held at a grand venue.
* Banquet: A formal dinner.
Informal Gatherings:
* Get-together: A casual gathering of friends or family.
* Gathering: A general term for any group meeting.
* Hangout: A relaxed social gathering.
* Meet-up: A planned meeting, often organized online.
* Social: A casual gathering, often held at a pub or bar.
Specific Events:
* Celebration: A gathering to mark a special occasion.
* Festival: A public event celebrating a particular theme or culture.
* Concert: A musical performance.
* Exhibition: A display of art or other objects.
* Performance: A public display of skills or talent.
Informal and Slang:
* Bash: A large and lively party.
* Do: A social event, often a party.
* Rave: A loud and energetic dance party.
* Shindigg: A lively and festive gathering.
Other:
* Gathering: A general term for any group meeting.
* Event: A planned occurrence, especially one with a specific purpose.
* Celebration: A gathering to mark a special occasion.
* Assembly: A formal meeting of people.
* Convention: A large gathering of people with a common interest.
The best word to use will depend on the specific context of the situation.