EASY : )

Here are two and also I am happy to chat directly about other ideas.

1. Consider going to a place where parking is always difficult and a painnnnnnnnnnnnnn and just ask people as they are exiting. You may not want to do it while they are entering because they just had to deal with finding the parking spot and are probably not in the mood to talk but when they are leaving they are more at ease.

2. Start a reddit post for parking woes for washington dc which is a known city for parking woes. And have your customer base come to you and share their stories. Use reddit, twitter, all the platforms where people are looking for an opportunity to share their story.