Hi Fidele,
Thanks for your interest in our plugins 🙂
You would be able to add a service charge fee on your events with our plugin Event Tickets. By adding our premium plugin Event Tickets Plus, you could sell tickets using an E-commerce solution such as WooCommerce.
However, I’m afraid there is no setting in Event Tickets Plus that would allow visitors to name a price for tickets.
We do offer 30 day refund policy though, so you could try it out and if it does not work request one.
Let me know if you have any follow up questions.
Cheers,
Jeremy