A ticketed event is when the host decides to charge admission for their event. You have the choice to get a % of the gate, get a flat fee, or get a fee vs or in addition to a % of the gate.
For example, you can charge an appearance fee of $500 vs. 50 % of the gate -- whichever is higher.
Or you can charge $500 in addition to a % of the gate.
Or you can just ask for a % of the gate.
"The gate" is the box office, or the total amount collected from ticket sales.