DrupalCamp Colorado 2015 is in downtown Denver on the Auraria Campus.
King Center of the Auraria Higher Education Center
855 Lawrence Way, Denver, CO.
View DrupalCamp Colorado 2015 in a larger map
AHEC Campus and parking map: http://www.ahec.edu/parking/ParkingMap.pdf
The conference takes place in the King Center. Rooms in use are the Concert Hall, Recital Hall, and several classrooms.
Light rail, bus, etc.
The location is convenient for many modes of mass transit with both bus and light rail stations within a few blocks. You can use the above Google map to get directions from your home, then select "bus" mode to see options and schedule. RTD Denver has more details on public transport.
Ride your bike! The platte and Cherry Creek trails will both get you right near the campus from miles around. Also, there is a B-Cycle station near King Center if you'd like to rent a bike.
Recommended visitor parking is in the Tivoli Lot at Ninth St and Auraria Parkway located directly west of the Tivoli Student Union or the Parking and Transportation Centre. Use this PDF map to see where the parking structure relates to the King Center where the conference is held.
Being so close to downtown Denver there are many nearby hotels.