I know this has become a cliched joke about the JW's and the coffee shop or MacDonalds but I swear these are the place I run in to them.
They never come to my door but if I go to the local Tim Hortons ( a mere 5 min drive form my door! ) on a Saturday morning say around 10:30, they are out in full force getting a double-double and a boston cream. Ditto for MacDonalds, I just need to go on a Sunday around 12:30 - 1 pm and Look! it's everyone who shuns me in public.
Maybe a mere presence in public in "kingdom hall" clothes is enough of a "witness" this days?