The EventLab is an amazing community asset and has created some mind blowing maps.
Suggestion 01 - No clip camera
Allowing the camera to go through buildings and through invisible walls, Allowing the camera to go higher in the world without having to place a platform then go up, then another platform.
Suggestion 02 - in game screenshot preview for event selection.
Knowing what you’re about to click on and play before you click on it, allowing the user to set an image from the in game blueprint to showcase the event to the users.
Suggestion 03 - EventLab UI
The community now creates a vast amount of tracks, unfortunately the menu system for EventLab is out dated and only shows 15 tracks maximum. I say the page should have smaller icons and have potentially 45 tracks on a page per page basis which you can scroll down.