Feature request

Is the feature request related to a problem? Please describe

Event is unknown whether it's free or paid.

Describe the solution

Event can show if it's free or paid.

With a very simple ticket category.

Describe alternatives considered

The more complete one is using to have a complete ticket system, but it might take too much time for now.

Additional context

Only little similar to Luma, but just focus on the price field. So it doesn't have to create a new model.