NOT present subscription to the event

have you tried to use custom event attributes at Settings > General > General Options – https://wp-events-plugin.com/documentation/event-attributes/

Thanks for the suggestion! I thought it would be an answer but… I just get an attribute in the post admin interface and not in the event itself on the website. Moreover, in the list of the bookings, I don’t get the attribute info either.

to add an attribute in the events page/frontend, you have to use #_ATT{attending} in settings > formatting > events

also, EMPro has custom booking forms – https://wp-events-plugin.com/documentation/custom-booking-forms/

OK thanks ! I thought I was doing something wrong but it’s precisely what I did. I guess my theme doesn’t accept such modifications. I fixed it in another way and it works well ! ??