I'm not too sure, but i'm in the same position as you! I'm hoping to see LND but in Febuary, on a saturday matinee also hoping that Ramin and Sierra will be performing. I know Ramin dosen't do Wednesdays as he says 10 shows a week is too much, so he lets his understudy do them, but i'm not sure about Sierra. Ramin has a facebook page, and people reguarly post comments if Ramin is ill or if he is not performing on certain dates. His holiday dates are 24th to the 29th of January, so depending if he's ill or not, he should be performing :) Hope this helps
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