It's not Christmas without Mariah Carey's smash 1994 hit "All I Want for Christmas Is You." And when the Hudson's Bay flagship at Queen and Yonge reveals its holiday window display today, Carey will be on hand to usher in the most wonderful time of the year.

But if you're not interested in the Yuletide festivities, and really on the 501 to travel across the city, this event might have you saying bah humbug tonight.

That's because the Queen streetcar route won't run between Yonge and Bay from 5:30 to 8 p.m. this evening.

According to the TTC, "501 Queen streetcars will divert in both directions via Church Street, King Street and Shaw Street."

REMINDER: 501 Queen will divert from approx. 5:30-8 pm today for the "HBC Holiday Window Reveal" at Yonge. Details: https://t.co/FNiO3WoLcI

— Brad Ross (@bradTTC) November 3, 2016

The 501 and 503 shuttle buses will also be diverting as follows:

• Eastbound: East on King Street, south on Strachan Avenue, west on Douro Street, north on Shaw Street, east on Queen Street, south on University Avenue, west on Adelaide Street, north on Church Street, east on Queen Street to Jarvis Street.
• Westbound: South on Jarvis Street, west on King Street, north on York Street, west on Queen Street, south on Shaw Street

Photo via Facebook.