Swiss President Simonetta Sommaruga is turning 60 on May 14 and is planning a party with a difference by inviting along all Swiss citizens who share her birthday.There were 94,372 births in Switzerland in 1960 -- the year Sommaruga was born -- meaning that the average maximum number of invitees would be around 258.Sommaruga is not taking any chances with potential gatecrashers and is asking prospective celebrants to submit a copy of their passport through the presidency