What new custom-race mode did Forza Horizon 5 add?

What new custom-race mode did Forza Horizon 5 add? EventLab.

EventLab is Forza Horizon 5’s creation toolset for building custom races, games, and other player-designed activities. It lets players go beyond the standard event formats by altering routes, rules, objectives, props, and gameplay conditions, then sharing their creations with the community.

The feature expanded the customization concept introduced in earlier Horizon games. Forza Horizon 3 added Horizon Blueprint, which allowed players to modify existing events by changing details such as routes, car restrictions, and time of day. EventLab developed that idea into a much broader creative system.

The names in this question can be easy to confuse. Horizon Blueprint is associated with Forza Horizon 3, while Route Creator was a Forza Horizon 4 tool. Car Meets are social activities, not a custom-race editor. EventLab is therefore the canonical answer for Forza Horizon 5’s new creation mode.