Digger Dudes

We signed the contract for the digging work today. Friday the 13th is a meeting at the lot with the architect, house builder, cellar builder, and the digger dude. I wonder what the digger guys are called? Since it is the 13th, will I need extra insurance? The uncomfirmed rumour is that the digger dudes can start as early as next week. That would be cool. I already got my shovel to help.