You could either create new user accounts with sufficient permissions to login and create them directly in the event editor or, if you’d prefer to limit their access to the admin environment, you could use a plugin such as Community Events.
We can’t quite do that but if you email Leah at pro [at] tri [dot] be and link to this thread she might be able to process a refund for you, in which case you could apply that to the cost of a Community Events license 🙂