cannot add multiple performers to event

[teusch]

Probably a schema.org problem but I don't understand if, or how, it is possible to add multiple performers to an event.
In the class event property performer it says :
/// Organization or Person A performer at the event—for example, a presenter, musician, musical group or actor. Supersedes performers.

But what does "Supersedes performers" mean ? There isn't a property "Performers" so how can multiple performers be added ? For example Siegfried & Roy . #tosoon

The same is true for Attendee/Attendees.

Thanx

[idenys]

May understanding is that Performer property would take a priority over the Performers property. But it's not clear to me either. Let me know if you can find the clarification elsewhere.