business networking (Frankfurt)

Hello. I will be in Frankfurt to develop business contact relationships for future offices to open in Germany within a year. Since I will be there for four months, I will have plenty of opportunity to develop relationships with connections who can refer potential employees, investors and clients to us. I would appreciate some insight into some of the best events to attend to meet high profile business leaders in the Frankfurt and Germany community. If you have suggestions, I would be very grateful.
Elizabeth