Re:
Were you thinking of organising something at a leisurely pace and distance or a bit more challenging? Something accessable to non-fixed / ss riders from different disciplines, or a longer faster road ride really only suitable for strong riders that are used to it?
Personally I do have a single / fixed bike but it is a wall hanger. I rode it to the pub once. It is an ornament, so the sort of thing I might be tempted to take out on a fine day for a fun ride.