How late is too late?

Advertisement for Simon Fraser University, Vancouver City Centre SkyTrain station, Vancouver, BC
(Photo taken March 29, 2015)

Date detail on advertisement for Simon Fraser University, Vancouver City Centre SkyTrain station, Vancouver, BC
(Photo taken March 29, 2015)

Is it unreasonable to expect that advertising for events be current? Should I expect to see an advertisement for events still up three weeks after the events are finished?

I think the answer in both cases is no. Yet, this advertisement was still up on April 5th. Even if the advertisement isn't coming down, just put a plain black sticker over the dates of the Info Sessions that are complete.