I can't see any problem if you go to Canada as early as now. Just make sure that your visa is valid to enter canada, plus I cannot see any restrictions in CIC for international stidents to come to canada too early. VO already gave our visa so they believe that our main intention is to study and not to work. Why should they have to doubts if we came early?
My class will start on end week of August and I booked my flight on may 24, 2015. They said that its risky to flg early but for me it's not. Just make sure you have money to support your stay there without working.