The best alternatives to Surfboard are Eventbrite, HeyLets, and Evnnt. If these 3 options don't work for you, we've listed a few more alternatives below.
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LaunchDarkly— Helps devs ship faster and safer with feature flags
Indgo is an event finder and messenger that showcases events in your area. Whether you're traveling or just bored on a Tuesday night, Indgo aims to show you a cool event that is happening right now.