Find events.
Eventbrite API is a free Events API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Internal / public / partners API documentation, replacing Apiary.io
Details from eventbrite.com.

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The Eventbrite API is provided by Eventbrite API Docs (eventbrite.com). Internal / public / partners API documentation, replacing Apiary.io
Yes. The Eventbrite API is listed in the Events category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Eventbrite API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the Eventbrite API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Eventbrite API is served over HTTPS, so it's safe to use in production.