An RFE (Real Flight Event) is an event where the real world airline schedules of an airport are followed during the time of event by the participants..
Many airlines fly into Schiphol daily. So, by participating of the event, you'll have the opportunity to see different airlines on the airport.
During the event, as much ATC stations as possbile and required are staffed to provide ATC service to the pilots.
Every IVAO member can join in the event by making his/her flight. So, the RFE is an opportunity to meet new people from different cultures.