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tls25rs: you may just want to email David Olcott (quoted above) and see if he'll slip you in ahead of time.
They need a signed and notarized (yes, wtf, notarized) liability waiver, but he can email you the blank form if you want to print it yourself to bring to a notary. If you're able, see if he'll let you get that in the mail by tomorrow and maybe he'll accept payment and your selection of classes in advance.