Mtb XC Racing Skills Clinics

Does anyone have any suggestions for mtb skills clinics. I have done an intermediate course with AMBC and that was great, but the more advanced XC clinics are not scheduled regularly.

I found that once you have done a clinic you get more improvement out of your general practice, as you try to ride using the techniques. Better to practice good technique rather than dodgy technique.

Since its been over a year since the last course I was on I am keen to revisit and extend what I've learnt.

Any ideas?