How can I make my sister feel better ?

My sister is obsessed with Guns N Roses she has a crush on Slash she's been crying about him. She's been in love with them since she saw Slash on South Park theyre her favorite band besides Motley Crue. She wishes she can go see them but our parents don't like them our mom doesn't think she can handle a concert like that we went to saw Survivor they were at our county fair they had drunk people everywhere someone pushed my sister almost over the fence the girl who's friend did that threatened to call her husband on us who was a police officer my sister didn't do anything wrong it was that bitches friend that did it. That was just at a fair. Also my sister has special needs and disabilities she loves rock n roll and country she really wants to see Slash and meet him and hopefully marry him. She feels bad because she knows she'll never have the chance with him also she's knows he won'tgo for someone like her. How can I make her feel better ?