In preparation for seeing the show my husband and I watched all 8 Harry Potter films this past week. It was a lot of fun and reminded me why I enjoyed the series so much. Turned out to be unnecessary for enjoying Potted Potter, but I don't regret doing it.
Potted Potter was hilarious. I haven't laughed so hard in ages. It's a great performance by the two writers/performers, Daniel Clarkson and Jeff Tuner, and does tell the plots of all 7 books - if not all the surrounding fluff. And their Quidditch match! Honestly, if you liked the books or the movies and want a good laugh, it's a brilliant show. There's a lot of audience interaction involved and it's kid friendly.
As Once Upon a Bookshelf said in their review of the show, some of the jokes don't quite translate to Canada, but they actors rolled with it well when a joke didn't get the laughs they were expecting. They also rolled well with unexpected occurrences, like when the young seeker they pulled from the audience brought the snitch down in an overly enthusiastic manner.
You can see an interview with Daniel and Jeff here that includes a few short clips from the performance.