Although I am looking for something like this,convier.me's example script didn't work for me:

curl https://convier.me/api/event \ -H 'Authorization: Bearer YEAH_SURE...' \ -d 'event[start][date]=05/26/2019 08:00 PM' \ -d 'event[end][date]=05/26/2019 11:00 PM' \ -d 'event[organizer][name]=Tony Stark' \ -d 'event[organizer][email][email protected]' \ -d 'event[summary][text]=Endgame premiere' \ -d 'event[description][text]=Bring the popcorn.' \ -d 'event[attendees][0][email]=MY_EMAIL'

(with API Token and email filled in of course) gives me

HTTP/1.0 402 Payment Required Cache-Control: no-cache, private Content-Type: application/json Date: Sat, 09 Jan 2021 12:52:48 GMT

{"error":true,"message":"SQLSTATE[42803]: Grouping error: 7 ERROR: column \"activities.created_at\" must appear in the GROUP BY clause or be used in an aggregate function\nLINE 1: ...NTH FROM created_at) as month, EXTRACT (YEAR FROM created_at...\n