SELECT * FROM Event ( (reference_id IS NOT NULL AND `group` IS NOT
NULL)AND(reference_id IN ('4728' , '4732' , '4756' , '4785' , '4787') OR
reference_id IN ( '4729' , '4733' , '4757' , '4786' , '4788')AND (/*
Horaire en semaine */((current_timestamp....
