I use the second post on this forum to update the event, list regiments, and make the teams. Be sure to check it out before this Saturday
Teams are somewhat flexible, the only thing that will be 100% sure is that regiments who either didn't get to be Russia last event, are new to the event, or called dibs on being Russia are guaranteed a turn as the ambushing side. You might not have the team that is listed, but that is the attempt if you wish to try and make some kind of plan before hand.