Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: Happy birthday The China National Opera (CNO) will give a concert to celebrate its 50th birthday . Different generations of CNO vocalists , like Li Guangxi , Yao Hong and Ma Mei , will present the concert which will feature both songs from famous Chinese operas like "The White-haired Girl" and "The Hundredth Bride", as well as , arias of such Western opera classics as "Madame Butterfly", "La Traviata" and "Rigoletto". Time/ date : 7:30 pm , September 7, 8 Location : Tianqiao Theatre  Tel : 6551-4787, 8315-6170 Tickets : 60--500 yuan (US $7.2-- 60.2) Folk music A concert will be held to feature some recently composed traditional Chinese music works . The concert , given by the Folk Orchestra of the China Opera and Ballet Theatre , will include such pieces as "Memory of Childhood ", "Memorial Ceremony for God "and "Wine Song". Time/date: 7:30pm, September 13  Location: Concert hall at the National Library of China  Tel: 6848 -5462, 6841-9220 Tickets: 30-200 yuan (US$3.6-24.1) Moon music A concert of traditional Chinese music will be given on the eve of the Moon Festival which falls on September 21st this year. The concert will feature a number of famous pieces centered on the theme of the moon, such as "Moonlight", "Spring night on a Moonlit River" and "Lofty Mountain and Flowing River." A number of established traditional Chinese music performers like Zhou Yaokun and Fan Weiqing, will play solos as well as collaborate with the folk music orchestra. Time / date: 7:30 pm, September 21st  Location: Grand Theatre of the Cultural Palace of Nationalities  Tel: 6606--8888, 6606--9999 
 Answer: 6848--5462
