Being a list of the things that count as a season of covenant service

Unless otherwise specified you can only do each thing once a year, but
you can do two things for reward in each year.

* Teaching (up two twice a year)
* Writing a Tractatus for the library (copyright goes to the
  Covenant).  Only if you have non-negative Communication
* Going on Adventure on behalf of the Covenant
* Staying in Esk and dealing with any problems that come up. 
  (once per year, but subsequent seasons can count for *last* or
  *next* year)
* Collecting Vis from the covenant vis sources that are somehow
  inconvenient.
* Making enchanted items on behalf of the Covenant (this could take a
  lot of seasons.  You can "bank" seasons for subsequent years.  Up to
  two count per year)
* Making longevity rituals on behalf of the Covenant
* Going to Tribunal / Grand Tribunal (one season for Tribunal, two for
  Grand Tribunal)
* Anything else required by the Senior Council that they deem
  appropriate.
  
Service is valued at 2 pawns of form vis per season (or 1 pawn of
technique vis)