There are various options for eating on campus. The two main locations are the Students Union Building (SUB) located at the southwest corner of the Main Quad and HUB Mall, which is a very long building in the east part of campus: see this map.
A map with more locations of dining services can be found here. The hours of operations during the summer are indicated here.
Unfortunately, it seems that the Lister Market is closed for the summer, but the Marina inside the Lister Centre is open from 7am till 10pm every day. One option for breakfast is Engrained, which is located at the south end of the second floor of the Edmonton Clinic Health Academy (ECHA), across 114th street from the hospital: see the map above. There is also a Tim Hortons on the ground floor of the Central Academic Building, which is just next to Cameron Library.
There are shared kitchens at Lister Centre which you can use. The closest grocery store is the Safeway located at the intersection of 82nd Avenue (Whyte Avenue) and 109 Street. Unfortunately, it is not near the student residences. A few buses from campus can drop you there.
The BBQ on Wednesday, August 14, will take place at picnic site 2 at Hawrelak Park, west of the university campus: see this map.