Labor Day Weekend or Aug. 30/Sept. 1 if Labor Day comes late. The cornucopia of stuff, from appliances to furniture that magically appears on streets across the neighborhood as people move out (and in) of their apartments:
In need of a car if I'm going to do some serious Allstonmas/Mission Hill Xmas shopping.
-- James Peter.
Although named for Allston, it's also celebrated in other student-heavy neighborhoods, such as Brighton, Mission Hill, the Fenway and the North End.