We don't always have to designate a time. I mean designating weekend times is a good idea, but if you have a few extra minutes online or if you're just hanging around, you can pop in chat. I'm going to try to do that more often.
The weekend time thing is a good idea because that's a time when people are usually free, but some week nights or late afternoons, I'll try to hang around a little while in the late afternoon.