-- hopefully helpful!!
Firstly I have found it helpful to know that every parkrun has a parkrun webpage PLUS a facebook page.
So, if I was to decide that I wanted to go to a new (to me) Parkrun somewhere in the world - I would firstly go to parkrun.com/ to decide which country I want to run in ( I will now choose Australia) , so I would go to the Australian parkrun webpage parkrun.com.au/ , I would then click on "EVENTS" to choose a particular Parkrun, and from the popup map, I would click on a particular PR -- in this case , I will choose DARWIN ( it should be lovely running in Darwin right now with the heat and humidity NOT!!) , so clicking on the Darwin icon will take me to their webpage page parkrun.com.au/darwin/ from which I can then go to the "course" page to see the map/details/instructions regarding their course parkrun.com.au/darwin/course/ -- at the bottom of that map I would then click on the "View Darwin parkrun in a large map" link to get a good sized Google map of the course.
Then I would do a Google search -- Parkrun Facebook Darwin -- and I would then be able to check out their facebook page facebook.com/darwinparkrun which will show me pics of recent runs - what kind of people I can expect to see, get an idea of what the track looks like , etc . For example, if you look at the 3rd photograph in the set of 178 photos , you will see a pic of some "runners" that I am certain that anyone here would be able to beat home!!
I would also then go back to the Darwin Parkrun webpage and click on RESULTS/NEWEST RESULT - to check out what age groups run there, what kind of times the fastest and slowest do, etc.
There is no need to go to a new (to you) Parkrun - blindfolded !!