Don't compare a large American city to a large Canadian city for this tournament. Being a Canadian junior hockey fan, you should know that this tournament wouldn't be 3rd page news in the sports page, while it headlines the front pages in Canada.
The IIHF doesn't fear a large city. Here are all city populations of past World U20 Championships...Of course, these are all current, but my point will be made. Cities over 250,000 in population are in bold. (
http://www.citypopulation.de/cities.html )
1977 - Bystrica - 83,056 ...Zvolen - 43,789
1978 - Montréal - 3,426,350
1979 - Karlstad - 80,934
1980 - Helsinki - 559,716
1981 - Fussen - N/A
1982 - Minnesota (not sure which city)
1983 - Leningrad- 4,669,400
1984 - Norrkoping - 123,303 ...Nykoping - 49,310
1985 - Helsinki - 559,716 ...Turku - 174,618
1986 - Hamilton - 662,401
1987 - Piestany - 30,606
1988 - Moscow - 10,101,500
1989 - Anchorage - 268,983
1990 - Helsinki - 559,716 ...Turku - 174,618
1991 - Saskatoon - 225,927
1992 - Fussen - N/A ...Kaufbeuren - N/A
1993 - Gavle - 91,276
1994 - Ostrava - 314,102
1995 - Red Deer - 67,707
1996 - Boston - 589,281
1997 - Geneva - 177,535 ...Morges - 13,824
1998 - Helsinki - 559,716 ...Hameenlinna - 46,734
1999 - Winnipeg - 671,274
2000 - Skelleftea - 71,813 ...Umea - 106,525
2001 - Moscow - 10,101,500 ...Podolsk - 181,500
2002 - Pardubice - 89,725
2003 - Halifax - 359,183 ...Sydney - 109,330
2004 - Helsinki - 559,716 ...Hameenlinna - 46,734
2005 - Grand Forks - 48,546