Hogsmeade weekend trips

Hogsmeade Weekend Trips are special trips that the students at Hogwarts School of Witchcraft and Wizardry can have a chance to go to and shop. To get there they walk from the school and spend the day there. Only Third year students and above are allowed to go on the trips. But they have to get a parent or gaudian to sign a permission form before they are allowed to go.

In Harry Potter and the Prisoner of Azkaban Harry did not get his permission form signed and kept asking Professor McGonagall if he could go. In the end he couldn't go and stayed behind for trips, until Fred and George Weasley gave him the map, and he went by the One-Eyed Witch Passage. Later on Neville Longbottom got his Hogsmeade trips taken when he left his Gryffindor passwords lost.