Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

craigslist - craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

Bedpage - Bedpage is a classified ad posting a website that comes as the alternative to Backpage and offers almost all the major services to post for multiple categories.

pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features

Facebook Marketplace - Marketplace is a convenient destination on Facebook to discover, buy and sell items with people in your community.