Hi Ronnell,
Great things to think about! We are absolutely adding original content in other areas of the site. The ideal audience here is me, lol. I am a homeschooling mom and there are no other sites that list out events the way I do. I know, because I've searched for it myself. It doesn't exist and would be super-helpful if it did.
Since I am my ideal visitor, I ask myself would it annoy me to have to navigate through a menu to find my state of Georgia when I could just put in my zip code on the top level page and save myself a click. Yes, that would annoy me. But from a SEO standpoint, the Georgia page is probably better, so I'm not sure which is best to implement.
As far as event pages on my site vs going to the 3rd party website, I again ask myself which would I prefer, since I am my ideal visitor. I would prefer to stay on this website. It annoys me to keep leaving a website to see what the event is and then having to close that separate tab, return to the site and then continue checking the list of events. However, when I check other homeschool sites, they all link directly to the 3rd party website.
Copy/pasting content from the 3rd party sites... again, I don't like going to the 3rd party site for information. When I'm on a homeschool site and their 'original' description is "this looks like fun, i've never been there, but heard its great", or some other 3 or 4 sentence description - well I hate those descriptions because they tell me absolutely nothing. So personally I like to see the meat and potatoes description that's on the 3rd party website without having to go to the 3rd party website. But since it's simply duplicate content from the 3rd party, it's probably not best for my SEO, which is why no one else does it. So I really don't know which way to go!
-J