Note the date of this race has changed from Saturday (1/15) to Sunday (1/16). You can register for the race here.
Times vary from BKL races in the morning to the open/citizen races after noon.
Temps will be very cold the day prior, with abrasive manmade snow. To prepare for this, put at least two cold layers of wax (Swix CH4, Toko Blue, or other similar cold, hard glide wax) into your skis to harden the base. If you have a cold, hard graphite wax, apply this layer first (scraping and brushing before subsequent layers).
If you have Toko X-Cold powder or Swix CH3 powder, these are good options to put on the skis as a final layer. The preferred method here is to crayon or drip an amount of blue or green wax onto the skis first. Then, before ironing, sprinkle cold powder over the glide zone. Iron the glide wax and cold powder together. See video below for reference. Be sure to brush out skis thoroughly!