So, here's the deal:

My prom is coming up, and I want my hair to be a dark forest green for prom. I only want my hair that color for prom, and as soon as possible afterwards I want to dye my hair some vibrant colors that will require a double bleaching of my hair. I don't mind if it's a few days after my prom that it comes out, but no later than that.

I am afraid of damaging my hair, so I will only bleach my hair twice.

I was thinking about using Manic Panic's Enchanted Forest since Manic Panic dyes dont seem to last long. I was hoping to either put it over my natural hair color (dark brown) or bleaching my hair VERY lightly to a medium brown so that when I came around to having to bleach my hair I would still be able to bleach it twice without destroying it.

I was also considering the possibilty of using this:
http://www.manicpanic.com/dhgels.html
and mixing the electric lizard with raven. I'm not sure if it would work if I mixed them, though.

Im sure what I just typed was confusing, but hopefully someone will be able to understand and help me out.

thanks.

I think the best thing to do is to use Enchanted Forest.
I'd do a strand test and see how it looks on your natural hair because there's a good chance that bleaching isn't necessary.
And because your hair isn't bleached the dye will tend to fade faster.
Greens aren't too hard to get out though.
I recommend lots of clarifying shampoo.
And because the weather is nicer now, definitely take a dip in a chlorinated pool because that works well too.

thanks!
Yeah, I think I'll do that. hopefully it won't end up looking black or something.

Only thing I qould recommend is NOT using SFX Sonic Green. You might have green hair for three months with that stuff.

Yeah, I'd test strand a bunch of things you were thinking of doing.

Yeah, I know better than to use SFX for this. thanks though.
strand test sounds like a good plan.