I have to admit that I had no idea that May 27 was the 30th Anniversary of Space Mountain, until I saw folks walking around in the park with the buttons. Luckily when we went to Space one of the CM's had a few buttons in his jacket so everyone in our group got one.
But, I have to wonder why there wasn't anything special besides this going on. For the 40th Anniversary of POTC they had all these special items out, signings and a banner over the entrance with CM's handing out stickers.
Then here comes Space Mountains 30th and they just give out a button at the entrance. I appreciate it, don't get me wrong ... but compared to other anniversaries of attractions this was kinda low key.