Im 13 what are things i can do to earn money for a concert?

ok so i really really want to go to a christina grimmie concert in august but i have like no money and there like no babysitting jobs the ticket is 120$$ and i need it by like the end on july i dont know what to do my parets are cheapos so they will like say no to house chores theres like no dogs i can walk i cant really sell cookies or business cards or stuff HELP ME