(i'm french, sorry if I make mistakes). 
Hello, I'm trying to link my entity (called "Evenement") to itself, because 0 to X evenement can be linked to an evenement. 
I have one form to add a new evenement (it's working fine) and on the same page, I want to have another form to link evenement that I choosing to the current event. 
So in EvenementType, I have two builder (i don't know if it's a good solution, so I commented the second builder and I made EvenementAssocieType.php with this builder). 

But when I check an evenement (a checkbox is used to link an evenement to another), nothing append and in the profiler, my submitted form doesn't appear.

You can find my code here : <https://openclassrooms.com/forum/sujet/symfony-evenements-lies-a-un-evenement>

Thanks for your help !