There is list on the public area of the Gauge O Guild website, but it is already incorrect as a number of traders on the list have stated in the Guild's members forum that they are not attending. Others who are travelling tomorrow, are waiting to see what the weather conditions are before deciding and some of those attending have indicated they are bringing reduced stock.
Hopefully the Guild will post an accurate list before opening time tomorrow, but I am not holding my breath. The latest cancellation is the Scale 7 Group.