People (including me) suggested part of that procedure... on the first page.
Some people keep talking about the temperature as if it hasn't been covered. I even proposed a safe method to totally eliminate temperature from the equation by having people get their own reference laser.
Quote from myself:
Furthermore, I would suggest everyone who has calibrated his meter, to make or obtain his own reference laser (which is long-term stable), and whenever making new measurements, use this reference laser to obtain a correction ratio (to compensate for fluctuations like temperature) This way, ambient temperature has not to be taken into account at all. (when the reference laser is measured right after the calibration laser (the latter one being the one being shipped to everyone)
End quote
To further elaborate, contestants measure their received 100mW calibration laser, say the meter reads "89". Immediately afterwards, you point your own reference laser at the meter, and it might read "76". With this information, the meter itself does not have to be adjusted, but future measurements instead. (or adjust the meter if you insist, it'll even simplify the equations)
In the future, in another season, this person has a laser he wants to know the power of, so it points it at his meter, which reads "232". Immediately afterwards, he points his own reference laser at the meter, which might read "79" now because of temperature differences. Then calculate 232*(76/79)*(100/89) = 221 mW
Are there even participants NOT in the US? I would still like to participate (I'm in Europe/Holland)