Last year it drizzled / rained all night but wasn’t too muddy per se. That said we’d rather a dry ride this year!
To answer the OP’s Q my first event was in 09 was as a duo and we started on alternating single laps and then a block of two each.
Last year as a trio we did one lap each at a time. Our 3rd man is a strong rider but had no MTB race experience and struggled. Here’s my club write up – http://egcc.net/display-items.php?intItemID=715
Other tips?
It’s a laugh so don’t take it seriously. It’s character building if its raining!
We shall be packing multiple sets of clothing and I can’t recommend a decent sized tent/gazebo/canopy in order to sit in.
Try and get some shut eye if you can between laps.