your city doesn't have taste of science? that's easy to fix!
you can start small for the festival, with just a handful of events — you have plenty of time to plan and organise... and you have an experienced central team to help you every step of the way
to make a team, there are a few different roles to think about:
Coordinator — pulls the operation together
Publicity — for promotion: Twitter, Instagram, Facebook, local Media...
Website — posting the events on the website
Sponsor — some local businesses are happy to help financially
then you can think about possible venues — you might find some people to be Venue Scouts
speakers are quite important... so a Speaker Liaison is good to keep the talent happy! do you have universities or research institutions in town?
for the actual events, its good to have some more helpers: Event Managers
you don't need this many people to start with, but if you can spread the work around it's easier