tummler

noun3

1. •
   (US) An employee, usually male, of a Borscht Belt resort charged with the duty of entertaining guests throughout the day by providing any number of services, from comedian to master of ceremonies.

   • Brooks began as a Tummler (master entertainer) at various Catskills resorts, where he honed his skills at telling jokes and doing impersonations. — 2015
2. •
   A person with an official role which involves facilitating social interaction.

   • But most of all, we can’t forget why we needed moderators in the first place: They’re our tummlers, helping us have a good time. — 2020
3. •
   A lively, mischievous man.