Because I went to there concert

Clues???

Hi my name is Casy Backer I'm 16  turning 17. I come from a family with very little money. We can barely afford a loaf of bread. My Mom has six jobs, subway employee, janitor at the hospital, Teacher's Assistant, grocery store clerk, Old folks home helper, kwikii fill cashier, and Mom. Jackson my oldest brother is a janitor at the collage he's attending. What ever money he gets he sends half home to us. Jackson's 23. Mason is my second older brother he works at the farm across the road. He gets paid very little. Mason is 19. I am the babysitter which means that I watch the little kids while my mom and brothers are away. I watch Andrew, Jason, Drew, and Maria. My Dad left me when I was a baby. The little kids were adopted by my Mom because there Mom died in a car accident and there Dad walked away. I have loved the band Cash and Maverick for quite some time now. The last tour they went on I couldn't go because we didn't have the money. So Mom said no.  I was fine until all my friends at school started showing me videos and pictures of them at the concert.

Clues...??
One day I came home after school I went to my room and threw my bag on the floor. When I turned around to see my mirror there was a post-it note on it. I went over to the mirror and picked it up.

I was confused but went to the basement to look through the Halloween decorations. I found another post-it note..

I thought for a second then realized that this person was talking about my Art shack. I looked through the shack but didn't see it until I turned on the light. There was a shadow from the light. So I grabbed a chair and got the next note...

I went to Jackson's old room and went through his dirty laundry because the note said good luck. It smelled so bad that I almost threw up. But I found the next note...

I went to the front porch and picked a rock Mom had hidden a spare key under so when I took the kids out we could come come and unlock the door. I found the next clue...

I walked to the garage and opened the door. Then I walked in. As I was looking for the clue I noticed a post-it note on my Cash painting...

I took the note down and read..

I walked to the back porch and Mom was standing on the porch waiting for me. She handed me an envelope...

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