Sounds like you have a reasonable plan going forward. There is no "right" choice -- everything has pluses and minuses. Some thoughts:
1. You could ask them whether this suspension is considered an "adverse action". If possible, you'd want to review your HR/GME policies to see exactly what specific language they use. This would clarify whether this is, in fact, punishment for some perceived wrongdoing, or a cooling off period so they can investigate and sort things out. If you want to be less confrontational about it, you can ask if the suspension is paid or unpaid -- if paid, it's likely non-adverse. If unpaid it certainly is.
2. You might want to request that someone from HR attend your upcoming meeting. This is a completely reasonable request, and it puts a (potentially independent) 3rd party in the room.
3. If they do try to place blame on you for all of this, what they might do is say: 1) This didn't happen the way you said it did; 2) You talked to others and told them what happened, which wasn't "true"; 3) This amounts to slander / a violation of the code of professional conduct. I'm not suggesting this is what actually happened, just point it out so that it doesn't take you by surprise. Your response to this line of inquiry would simply be that you didn't feel safe bringing it to the attention of your PD/Chair. Their response is that you should have, privately, brought it to HR's or someone else's attention. In any case, I think you're best off focusing on the fact that you told someone else because you were scared, didn't know what to do, and was looking for advice. Not to "spread the word". Also probably best to stay away from "I was asking around to see if this is common practice, so I'd know whether to report it or not" -- they will argue that's HR's job and not yours.
Like others, I wish you the best. Hopefully they will simply sort this out. Perhaps it will change future behavior.
I don't think that pursuing legal charges through the court system will be very fruitful, unless you have a clear witness. Else it will be your word against theirs. So I'd focus on the retaliatatory issues here -- that's easier to prove, and a much deeper legal hole for them to fall into.