To be honest its a little early to safely organise evening rides, but this will happen probably from about mid April on.

As Patrick has already mentioned there are a few different groups who go out on the bikes.

Usually
Tuesday evenings are Mountain bike rides on Zuriberg or Uetliberg, organised by me.
Thursday evenings are Road bike rides organised by Hillseeker (and Dakman when he was here last year).
Sometimes we have weekend rides too which in the past have been organised by Patrick who posted previously.

Salsa Lover has talked about organising a more relaxed ride on either evenings or weekends for those who do not want to either Mountain bike or ride longer hilly rides which the Thursday rides normally are. I would imagine that he will try to organise some of these again once the evenings get longer. You can always post here yourself and see if you can get more people who want to go ride.

Hillseeker envisioned an environment where we would have about 2 groups or more riding at different paces and who could meet up for a beer afterwards. If we have enough people this might get off the ground this year.