It only matters if you are trying to include a bunch of people who can't bike to work (the retired, unemployed or work-at-home). Reason I asked is that there's a tremendous bulk of knowledge and a large community under this category.

We have a large gathering of people in my city for Bike To Work Week (which we are trying to rename as Bike Month). Several of the activities had no hard connection to work... in fact we had one event where cyclists organized a group grocery haul.

Nice to see a concept being more inclusive.