One night is going make for a busy day. I assume you will be riding in, staying the night and then hitting the attractions.
If it were me here's what I would do. Get up early (6:30 is not too early), ride down Rt3 Laconia Rd, just before the Weirs Bridge stop at Donna Jean's diner for a good breakfast (you'll need it) then cross the bridge turn right and park on Lakeside Ave. This is the first place for the vendors, bike build off and the HQ is there, walk the Ave and the Drive In and check out the goodies. This is the best place to get Tee shirts and souvenirs. Then head up Scenic Road (the only way out of Weirs) to the Broken Spoke Saloon and park behind the Saloon on the left (or you can try to find a paved parking spot at the Fun Spot just up the hill, left at the lights then park on the left). There are more vendors, bands playing there. If you still want more head north on Rt 3 Daniel Webster highway to Hart's Turkey Farm and Laconia Harley for more vendors, bands and the best turkey sandwich around.
Of course if you are not into shopping and people watching try to work your trip around the races (believe it or not some people actuality do watch them) The hill climb on Wednesday, bike shows, demo rides and many other events. You say you have booked so you will have to decide what is available.
Here are a couple of links to the Bike Week events:
Laconia MC Week
Laconia Harley
This will give you a taste of Bike Week, but one day is no where near enough time to enjoy it. If you can, convince your wife to join you and take a few days, she may enjoy it I know mind does. I can't even think of going with out bringing her. There is so much to see and do that you need at least four days. I've been going every year since 93 and still go for at least four days every year. If you decide to stay longer and can't extend your reservation I suggest heading to north Conway there are plenty of rooms there and They hold the Rally in the Vally to coincide with Bike Week.
What ever you decide have fun and keep the shiny side up.