Take the shock to a shop, you don't have the special tools and experience necessary, nor the time to acquire them for next weekend. Cost will depend upon how badly blown it is, and any damage.
On the clutch, yes it's possible you were sucking the oil in through the right side crank seal, or else you puked it out through a leaking seal. You're going to have to tear it down and find where it was leaking, and replace that seal and any others. Normally on Kawasaki's, this means splitting the cases.
Good luck getting it in shape for next weekend, looks like you've got a busy week ahead of you.