Hi, where can I buy tickets for Hangzhou West Lake Light show? Possible the day itself?

Well, there is no light show at West Lake itself. You can enjoy the West Lake Music Fountain at 19:00 and 20:00, which lasts for about 15 minutes. Or, you can see the extraordinary Light Shows at Wulin Square or Qianjiang New Town. By the way, they are all free of charge. You will certainly be amazed by the beautiful night scene of the city! :)