In the northern half of the U.S. at least, the summer vacation season begins with Memorial Day and ends with Labor Day.
(the summer vacation season; begins; with Memorial Day; L:In the northern half of the U.S. at least) (the summer vacation season; ends; with Labor Day)
the summer vacation season the summer vacation season
begins ends
with Memorial Day L:In the northern half of the U.S. at least
with Labor Day