I'm sure it's possible to give edit rights to other people. We can't afford to rely on resources owned by just a few people, it slows things down and causes confusion.
Right now, we need to update the REST call again one hour earlier to 4pm GMT instead of 5pm GMT. Is there anybody who can do it?
All committers plus some other people from marketing should have admin access to the calendar to add and modify events. If we can't fix that soon, we need to create another calendar with more administrators from the start or use another tool for scheduling.
--Ondro