Red Brick Warehouse Christmas Market 2020
December 4th to December 25th
11:00-21:00 (Last entry by 20:30)
Their official page has opened:
This year, they need to limit the number of visitors so you will need a reservation ticket to enter.
Weekdays: Admission free / Re-entry accepted / for 60 minutes each time
Weekends and Dec.23rd to 25th: 300 yen (free for elementary school children and younger but need to be accompanied by adult(s)) , for 60 minutes each time and no re-entry
Even though you get the ticket you may need to wait to enter if it is crowded.
Reservation and more information about entrance: