In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Let me give you an example: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
The answer to this example can be: How many books are there in the British Library?
Here is why: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

OK. solve this:
Article: Swan Lake Ballet When: Aug. 27, 2010 19:15 Where: Shanghai Grand Theatre Ticket: 80/180/280/380 RMB pre-sale (before Aug. 28) Description: Swan Lakeis ballet at its best. There are only two Swan Lake performances this month so get your tickets fast!Swan Laketells the tale of princess who's turned into a swan, and a prince who falls in love with her and struggles to save her from the spell in order to be with her. In the Mood for Love Ballet When: Aug. 31, 2010 19:15 Where: Shanghai Grand Theatre Ticket:80/180/280/380 RMB Description: A truly Chinese ballet, In the Mood for Loveis set in 1930's Shanghai and tells a story of two neighbors who fall in love . There will be some drama between these two characters which will be expressed and transferred to the audience through dance. The costumes are impressive and beautifully represent women's fashion back in the day. 2010 Jazz Festival Shanghai When: Aug. 29, 2010 12:00--23:00 Where: Pudong Century Park Tickets: 150RMB 1 day ticket / 200 RMB 2 day ticket Description: Shanghai turns into a city of jazz this October. Music fans will be able to enjoy a selection of jazz, blues, funk and reggae on the grass of Century Park and the festival includes 129 bands from 32 different countries and performances by three popular rock stars. Full Moon Beach Party When: Aug. 28, 2010 21:30 Where: Sanjiagang Beach Resort Ticket: 180RMB /150 RMB pre-sale (before Aug. 22) Description: Full Moon Beach Party is coming straight to the shores of Shanghai.
Answer: Full Moon Beach Party and Swan Lake Ballet
Answer:
Which of the following can you buy tickets in advance according to the text?