Things can be changed without a meeting if they are discussed and agreed upon (via phone, email, etc) AND the changes are documented in the IEP and everyone, including you, signs the revised iep. If something is supposed to be there, but is not, I'd contact them right away.
The issue of having extra time on tests and taking tests outside the classroom, as needed, came up on my son's iep several months ago. It had been in his iep as I just wrote it here, then it suddenly was not written in there anymore. The sd told me it was because a law changed stating that either a child gets that accommodation all the time, or not at all. I knew they were giving difficult child an opportunity to do this anyway, so I put it on my list of things to address at a later meeting. Anyway, when they said "a law changed", I assumed they meant our state law, but your area of concern might be a result of something similar, I don't know.
The iep is not valid without your signature, I don't believe, and that's the main thing.
