The phrase "a big gathering and" is correct and usable in written English.
It can be used when referring to a large assembly of people, typically in the context of events or social occasions, and is often followed by additional information.
Example: "We are planning a big gathering and hope to see everyone there to celebrate the occasion."
Alternatives: "a large assembly and" or "a significant meeting and".
The two men realized they have the same mother, and celebrated the discovery with a big gathering of family and friends on Saturday ― just in time for the holidays.
Growing up, every Thanksgiving weekend represented several traditions: a big gathering of friends and family on Turkey Day, a holiday tree-trimming party and writing holiday greeting cards.
But the moment I stood up in church ― I never imagined standing up in front of a big gathering of people and saying, "My son is gay.
But there's plenty of room for more screenings in this company town, and now Street Food Cinema has stepped up with an alternative take involving a movie on the lawn near the Natural History Museum of Los Angeles County, a big gathering of food trucks, and live music and audience games to get the evening started.
Overall, it's a big gathering of wrestling figure collectors and wrestling fans".
Cubo, a new 50,000-square-foot coworking space in São Paulo that launched last fall, celebrated its one-year anniversary with a big gathering of entrepreneurs, academics, venture capitalists and corporate mentors.
The Ukrainian opposition warned the new measures would further inflame the protest movement, and called for a big gathering in the capital Kiev on Sunday.
According to his daughter Emerald, Eric Garner "was very family-oriented" and "always loved a big gathering or a big family function".
The Maidan council - made up of protester groups and activists - announced its nominations at a big gathering of protesters at the camp, which is spread over Kiev's Independence Square.
A big gathering is planned in Flushing Meadows in Queens.
