Yes. The entire wedding celebration will be hosted at the groom's parents property, in their backyard.
The wedding reception will end at 6pm.
Since it is an outdoor wedding in the woods, we suggest that guests wear clothes their comfortable in, especially since it might be a little muddy. That means we would advise that women don't wear heels, and men don't wear their best dress shoes or best dress pants. You can still dress nice, but just be aware that it is in a grassy and semi-woodsy location.
With Fredericksburg, you never know, but it is always safe to assume that yes, there will be traffic. The wedding ceremony starts at 1pm on Saturday, so aiming to get there at around 12:45 would be good.