I've known many "full time" pioneers that just showed up for the meeting for service and then made 'calls'. This is a common practice - supporting the meeting arrangement with your suit and tie or dress on and then running personal errands.
When CO's are visiting, they always asks for everyone to attend the mid-week meeting before service - even if you're not 'going out'.
It reinforces the structure : what's important is how you appear to others in the congregation.
ginger