There is a large number of hotels in Dearborn, which is approximately 12 miles from Cobo Center. Also plenty of restaurants and shopping. Amenities range from very high end to fairly low end, so pay attention to your choices.
There are some world-class tours and museums in Dearborn. If your team is planning to do something at The Henry Ford or at Greenfield Village, or the Rouge Factory Tour, this area will be very convenient for those activities.
There is an IMAX theater here also.
One new restaurant that would be great for large groups is Ford’s Garage, 21367 Michigan Ave, Dearborn, MI, 48124. (313)752-3673
Some of the hotels in this area:
Hampton Inn, 22324 Michigan Ave, Dearborn, MI, 48124
Comfort Inn near Greenfield Village, 20061 Michigan Ave, Dearborn, MI, 48124
Edward Hotel & Convention Center, 600 Town Center Dr, Dearborn, MI, 48126
The Henry Hotel, 300 Town Center Dr, Dearborn, MI, 48126 (very fancy place)
The Dearborn Inn, 20301 Oakwood Blvd, Dearborn, MI, 48124 (very fancy place)
Hawthorn Suites by Wyndham Dearborn/Detroit, 5777 Southfield Freeway, Detroit, MI, 48228 (this is in the city of Detroit, but it is not downtown – it is on the border with Dearborn)
Doubletree by Hilton Hotel Detroit – Dearborn, 5801 Southfield Expressway, Detroit, MI, 48228 (this is in the city of Detroit, but it is not downtown – it is on the border with Dearborn)
A bit off the freeways, and with fewer amenities, are these relatively new hotels that will likely be a bit cheaper (although the area is not quite as nice):
Holiday Inn Express & Suites – Dearborn SW – Detroit Area, 24041 Michigan Ave, Dearborn, MI, 48124
Country Inn & Suites – Dearborn, 24555 Michigan Ave, Dearborn, MI, 48124
Staybridge Suites – Dearborn, 24105 Michigan Ave, Dearborn, MI, 48124
Not in Dearborn – its actually in Taylor – a bit further south, and actually in a pretty sweet location for driving in to Cobo, is a Comfort Inn near the intersection of I-94 and Telegraph Rd. (which is a major north-south road). Some amenities around here, but not as nice as Dearborn proper. Comfort Inn & Suites, 6778 S. Telegraph Rd, Taylor, MI, 48180.