DCount(;true) counts both the number of participants in an eventfile AND participants that are in the process of a registration currently, fulfilling a fiter

DCount("[Gender]="""  & [Gender] & """";true) 

Returns the number of participants already registered and those who are in the process of the registration who are of the same gender as the considered participant. 

Example:

• 5 female participants already existing in the eventfile
• 4 female participants not yet registered, but in the process of registering
• ==> 9 participants in total.