You'll be there during Architecture Week 2003, the national celebration of contemporary architecture which runs from 20-29th June - check out http://www.architectureweek.org.uk
for events in the City of Culture 2008!
You should really try the discussion board of the Liverpool Architecture & Design Trust, http://www.ladt.org.uk/,
while at http://www.liverpoolarchitecture.com/
they have a series of 'buildings of the month' and details of tours.