J.M.
Fall events... First off, the balloon fiesta. Second, check at Manzano Mesa elementary school which is nearby. (Southern and Elizabeth.) They have a fall festival every year. As far as pumpkin patches, you definately should go to the one in Moiarty... I'm blank on the name right now but it has hay rides and corn mazes as well as a pumpkin patch you can pick your pumpkin from.
Now for the library question. All the Albuquerque libraries are connected. They don't each carry all the books, but if you know what one you want to read you can have it delivered to the library of your choice using the online reservation option. (I use it all the time. Who has time to go all over town looking for a book.) Just get a library card and you are good to go. Lomas and Tramway is probably the closest.