Iconosquare - Schedule now. We'll post on Instagram for you later!
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Storyheap - Manage your SnapChat and Instagram stories.
Event Hunt - Startups and Tech Events Curated By Locals
Later - Schedule and manage your Instagram posts
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets