It certainly doesn't hurt to ask about assistance from the retail community.
I can tell you that for years at the Edmonton motorcycle toy run, the Wal-Mart at the Capilano Mall gathering point has been open and offering generous discounts on toys to motorcyclists walking prior to departure. I believe there were near 4,000 bikes this year. If half of them hit that store they did a handsome toy business that Sunday morning.
If these runs grow, it might be worth thinking about a retail parking lot departure location at some point when size dictates. It would be serving up thousands in sales to the store.