ELMSFORD, N.Y.--(BUSINESS WIRE)--Party City Holdco Inc. (NYSE:PRTY) (the “Company”) today announced that its financial results for the first quarter of fiscal 2015 will be released after market close on Thursday, May 14, 2015. The Company will host a conference call at 4:30 p.m. Eastern Time to discuss the financial results. Investors and analysts interested in participating in the call are invited to dial 877-201-0168 (international callers please dial 647-788-4901) and enter conference ID 399