There were many opportunities for him to attend a commission meeting after he was contacted about the speed humps. He could have come to any meeting and voiced his objections.
It is nearly impossible to publish an agenda prior to a meeting and if you are not online there is no way at all. I do publish in the monthly Mayor's Message a brief of the meeting that month which usually includes items of business that are being studied for a later meeting. So if you know that something you are opposed to is coming up attend the next meeting and speak up.