SeatGeek
Search events, venues and performers

Search events, attractions, or venues.
Ticketmaster API is a free Events API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Everything you need to start playing with the Ticketmaster API
Details from developer.ticketmaster.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
The Ticketmaster API is provided by The Ticketmaster Developer Portal (developer.ticketmaster.com). Everything you need to start playing with the Ticketmaster API
Yes. The Ticketmaster 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 Ticketmaster API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Ticketmaster API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Ticketmaster API is served over HTTPS, so it's safe to use in production.