Disney Sea fireworks performance weekly

i understand that Disney Sea doesn't have fireworks performance everyday. Is that true? Anyone knows where I can get more information on the performance show times? I can't decide whether to go on weekdays or weekends. Thanks!

Yes, the fireworks "Disney Magic In the Sky" are held everyday. Here are the schedules:
http://www.tokyodisneyresort.co.jp/en/schedule/show/index.html

I recommend to visit on regular weekends because it will be much more crowded on weekends, resulting in long waiting times for attractions and possible limitations on how many people can enter the parks.

Hi Uji, thank you for your advice! (: