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Apple Events for macOS - The unofficial Apple Events app for macOS
Facebook Local - Discover places to go and events happening near you
TechEvents.co - Tech and startup events aggregator
Event Hunt - Startups and Tech Events Curated By Locals
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Hop - Spike makes working easier and more efficient. Saving you and your team time, sanity, and a lot of headaches.