Harry Potter and the Prisoner of Azkaban is my favorite HP book and I really didn't like the fact that Harry wasn't allowed to go to Hogsmeade without a signed permission slip, so I made that part differently. In other words, he's allowed to go, but under certain conditions which you will find out if you continue reading.
Disclaimer- Anything that you may recognize does not belong to me, but to JKRowling.
This story starts in the middle of the Harry's 3rd year of Hogwarts, before the first Hogsmeade trip. Anything after that does not exist in this story, so it may be a little confusing. As is this explanation, sorry about that.
Harry Potter is just like any 3rd year at Hogwarts, if you don't include the fact that he has escaped death from He-Who-Must-Not-Be-Named three times, is a Parseltongue, has scar in the shape of a lightning bolt on his forehead, and is not allowed to go to Hogsmeade. He left rather in a hurry from the Dursley's, and didn't have time to get their signature, not that they would actually sign it after what he did to Aunt Marge. So now he has to try and convince the stern Professor McGonagall to let him go with the murderer Sirius Black on the loose.
"Yes, Mr. Potter?" Professor McGonagall asked as he approached her desk after class.
"Err, Professor. I was just wondering, with the Hogsmeade trip coming up next weekend and since the Dursleys didn't sign my permission form, I was hoping maybe you could sign it and let me go?" Harry asked hurriedly hoping maybe she would be too confused to make sense of what he said.
And once again he's dead wrong. "I'm sorry, Mr. Potter. But the rules clearly state that no one is allowed to go to Hogsmeade without a signed permission form. Besides, I think it would be better if you stayed inside the castle right now, given the circumstances." Professor McGonagall answered. Did her voice have sympathy in it, or is it pity?
"But I won't be alone; Hermione and Ron will be with…."
"That is hardly a comforting thought; do you really think Sirius Black will stay away from you because two teenage wizards are with you? No, Potter. I have already made up my mind." McGonagall finished with a tone that said this matter was not up for discussion any more. And yet Harry didn't seem to be getting the hint.
As he was walking away, he got a brilliant idea. Cautiously Harry asked, "Excuse me, Professor. But would it possible if a teacher went with me to Hogsmeade? I mean, surely he wouldn't attack if a teacher was with me?" Professor McGonagall didn't seem to like the idea so Harry did the only other thing he could think of. "I'll be the only 3rd year that's not going and I'll miss out on a lot of educational things." Harry was begging, even though he hoped he wouldn't have to go that far, but hey desperate times call for desperate measures. He rocked lightly back and forth on his heels as he waited nervously for her answer. Hoping it would be good news and not more disappointment.
"Well, Mr. Potter. I must say that that is an unusual idea. However, it's not a bad one. I will have to talk to the Headmaster about and if he agrees you may go. However, if the Headmaster does say yes only I or Professor Snape will be able to accompany you." Seeing the shock on Harry's face she explained, "Yes Potter, only Professor Snape or I. Every other teacher is simply too busy or has to watch the other students at Hogsmeade. Now go on to your next lesson, otherwise you'll be late. Oh and Potter, don't tell anyone about this arrangement, otherwise there won't be another one like it." Professor McGonagall warned as he left her classroom.
Harry dwelled over this as he was walking on to his next lesson, Charms. Fortunately, it's so noisy in there that nobody can make out what anyone else is talking about. Today they're working on silencing charms, and with all the pigs and roosters you could barely here your friends right next to you. Harry told Hermione and Ron what McGonagall had said, and he was not at all surprised by their reactions.
Ron as usual worried about anything that had to do with Snape. "But Harry, he couldn't possibly go with you to Hogsmeade; that would be torture."
"What do you mean 'he couldn't possibly go with you'? I thought we were all going to go to Hogsmeade together." Harry asked
"Oh yeah, sorry about that mate. I just can't imagine that the time we're supposed to have to get away from teachers, we can't. Well you can't, Harry. But don't worry we'll stick with you, even if it Snape." Ron apologized reluctantly and plastered a false grin on his face.
"Of course, Harry. This is a great idea. I mean Dumbledore's sure to let you go, and you'll be safe the whole time. Besides, I heard that Snape just gave out six detentions last lesson, apparently someone left a dung bomb in his drawer and it exploded. And I'm pretty sure he set the detentions for Halloween." Hermione told them happily. "Also, I'm sure he wouldn't want to be your 'nanny', and he'd make sure to get out of it." She added when she saw doubt on their faces.
Harry feeling much better than before left class to put his books away and head down to the Great Hall for dinner. He might actually get to go to Hogsmeade on Halloween. He'll go to Zonko's, Honey Duke's, The Three Broomsticks, and he'll visit the most haunted building in Britain, the Shrieking Shack. It's going to be a great Halloween; that is if Dumbledore says yes.