Quickie inspection before each ride (spin wheels, check brakes).
Several times a year check tire wear and eccentric tension.
As needed, re-wax chains, usually every 5,000/6,000 miles or so or at the first chain 'squeak.'
Sealed bearings means not much maintenance.
Every 3 months or so, use Pledge wax on our c/f tandem.
We do not have an '0ff' season here in Tucson.