The Finance Committee is having pre-budget consultations in advance of the 2018 Budget.  They advise that “Written submissions of no more than 2,000 words, including an executive summary, can be submitted to the Committee until Friday, August 4, 2017 at 11:59 p.m. Eastern Standard Time.”  

There is also a press release entitled “Canadians are Invited to Share Their Priorities for the 2018 Federal Budget June 2, 2017“.