Potential OSH Entertainment

As a followup posting to my "Why fly fast approaches?", I have an idea
for some evening entertainment.
Does anyone have an old police radar gun?
If Jay parks in the same area as last year, we can "grade" each
approach of arrivals based on their aircraft type and approach speed.
If someone brings a laptop, we can create a spreadsheet and develop
some realworld statistics about pilots and their approach speeds.