The Japan stop of the Ultra Music Festival which started in Miami in 1999 and is now held in over 20 countries worldwide. In Japan, the Ultra Music Festival has been running since 2014 and sees turnouts in excess of 120,000. There is a tiered ticket system with cheaper tickets getting sold out quickly. 3-day tickets start from ¥36,000, 2-day from ¥26,000, and 1-day from ¥15,000. See here for details.
Event details are taken from official sources whenever possible. It is always prudent to check the official event website before attending to make sure that there have not been any changes. If you know of an error in the calendar, then please let me know through the contact form.