Is it unhealthy to practice wearing 4 inch heels every day?

So, I'm 13 years old and i just started wearing heels anywhere, really, (not counting dress-up) this February and I discovered they hurt. A lot. But it was worth the pain to wear them for a couple hours to the school dances, which happen less than once a month. However now I have a bigger plan for these heels. I want to be Avril Lavigne for Halloween and these are the only shoes I have that would work. I've picked out the exact costume so just know I've got it all planned out. The problem is, I don't have any other shoes that would work for trick-or-treating OR for wearing my costume to school, so I'll be wearing then for 6 hours to school on Friday, then several more hours for the Midtown trick-or-treat on Saturday, then for several MORE hours for Halloween on...Monday? That's a l;ong time to wear heels, so I practice every day even if no more than just 10-30 minutes on the weekdays but on the weekends I wear them all day. Could this be harmful? I won't wear them every day over summer vacation but at least once a week. Idk...