Which they didn't know back in February. Even though venues had been negotiating with Springsteen's bookers since last fall, the dates for this leg of the tour weren't officially announced until mid-April.
Also not sure why you're putting this on Brandon. I'm no fan of his, but in this case it was the Rogers gang telling the Bills sorry, we'd rather have the Boss than you this weekend. Then again, at least they know HE can sell 40,000 tix in that barn instead of having to paper the house with freebies to make it look like Toronto cares about an overpriced football practice.