You cannot anchor
on Lake Union without a permit
from Seattle Marine
Patrol and they don't hand them out. There are many marinas
on Lake Union and it might be possible to find one for temp moorage. An easier solution would be to moor at Bell Harbor Marina located on the Seattle waterfront in Elliot Bay. The Boat Show
is at the football stadium exhibition center a couple of miles south of the marina. With the purchase
of a boat
show ticket you can take the free shuttle to and from the boat show to the boats afloat show on Lk Union.
You could, as suggested previously, anchor in Eagle Harbor and deal with the ferry
crossings, (half an hour trip) which will leave you a little closer to the venue. It all depends on how much your wallet lends itself to convienience.