There is a lot of construction in the Detroit area this summer. The exit ramp from Northbound I-75 to Square Lake Rd is closed as is the entrance ramp from Square Lake Rd to Northbound I-75. This will make getting to and from the Marriott (host hotel) difficult.
To get to the Host Hotel from Northbound I-75 it is suggested that you drive on up to University Dr, get off there, cross the freeway and get back on going south. The southbound exit to Square Lake Rd is open. Also, you can go to the M-59 west exit, and take that to Opdyke Rd and then go south on Opdyke to the host hotel.
To get to Northbound I-75 from the Marriott, take Opdyke Rd north to M-59 east. Go to the Northbound I-75 exit.
When going home, taking southbound I-75 is not possible through Detroit as there is an 8 mile long stretch of the southbound lanes that are closed for the next 2 years. The alternate route is to take (from the Marriott) Opdyke Rd south to Square Lake Rd west. Take Square Lake Rd to Telegraph Rd south, to I-696 west, to I-275 south to I-75 south. And actually, this is the route recommended for both coming to and going from SDAC 27. It is shown on the map below.
Barry