it took some work but I was able to piece together these dates for Mayhem's upcoming tour that has yet to be officially announced.
Mayhem / Keep Of Kalessin / Hate / Abigail Williams / Woe - 2011 North American Tour
Nov 2 - Talking Head Club - Baltimore, Maryland
Nov 3 - The Gramercy Theatre - New York, New York
Nov 4 - Trocadeo - Philadelphia, PA
Nov 5 - Montage Music Hall - Rochester, New York
Nov 6 - Palladium -Worcester, Massachusetts
Nov 7 - Imperial de Quebec - Quebec City, QC, CANADA
Nov 8 - Mavericks - Ottawa, ON, CANADA
Nov 10 - Opera House w/ Mayhem Toronto, ON, CANADA
Nov 11 - Peabody's - Cleveland, Ohio
Nov 12 - Blondie’s Detroit - Detroit, Michigan
Nov 13 - Reggies Rock Club - Chicago, Illinois
Nov 14 - Station 4 - St. Paul, Minnesota
Nov 15 - Crock's - Thunder Bay, ON, CANADA
Nov 16 - Osborne Village Inn - Winnipeg, Manitoba, CANADA
Nov 17 - The Exchange - Regina, SK, CANADA
Nov 18 - Starlite Room - Edmonton, AB, CANADA
Nov 19 - Dickens - Calgary, Alberta, CANADA
Nov 20 - Third - Prince George, BC, CANADA
Nov 21 - The Rickshaw Theatre - Vancouver, BC, CANADA
Nov 22 - El Corazon - Seattle, Washington
Nov 23 - Hawthorne Theatre - Portland, Oregon
Nov 25 - Grand Ballroom at Regency - San Francisco, California
Nov 26 - Galaxy Concert Theater - Santa Ana, California
Nov 28 - Clubhouse Tempe, Arizona
Nov 29 - The Complex - Salt Lake City, Utah
Nov 30 - Bluebird Theatre Denver, Colorado
Dec 2 - Trees - Dallas, Texas
Dec 3 - Backstage Live - San Antonio, Texas
Dec 4 - Emos - Austin, Texas
Dec 5 - Scout Bar - Houston, Texas
Dec 6 - The Hangar - New Orleans, Louisiana
Dec 7 - The Club at Firestone - Orlando, Florida
Dec 8 - Masquerade - Atlanta, Georgia
Dec 9 - Pheonix Hill Tavern - Louisville, Kentucky
Dec 10 - Tremont Music Hall - Charlotte, North Carolina
Dec 11 - Jaxx w/ Mayhem W. Springfield, Virginia