Hair dye help needs out within2 weeks?

I put a permanent dye in my hair in February n then decided I will just let my natural hair come through but its nee June and my formal is coming up in 2 weeks and my hair is like a gingery auburn colour since I dyed it dark brown is there anything I can do like home remdies I dont want to buy somthing out of a chemist or go to the hairdressers yet.