Strive Content Calendar - Manage & master your publishing schedule

Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Planable.io - Planable is the command center of social media campaigns trusted by agencies, freelancers, and marketing teams, that allows you to easily create, collaborate, get approval and schedule posts for your social media campaigns.

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

Notion Content Calendar - Take your socials to the next level.

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.