Fix 'Duplicate Code' issue in event\event.go

[CodeFactor](https://www.codefactor.io/repository/github/devopsdays/devopsdays-cli) found an issue: Duplicate Code

It's currently on:
[event\event.go:112-127
](https://www.codefactor.io/repository/github/devopsdays/devopsdays-cli/source/master/event/event.go#L112)[event\event.go:133-148
](https://www.codefactor.io/repository/github/devopsdays/devopsdays-cli/source/master/event/event.go#L133)