A motion can only be amended if the amendment doesn’t change the intent of the original motion. For instance, you could have a motion to create storage cages with chain link wire and amend that to create the cages with some other material – the essential motion is to create cages, so that would be OK But if someone proposed an amendment to use the space for bicycle racks instead of storage cages, that amendment would fail as it is changing the essence of the original motion.
And to answer the question about whe do you put motions up for the AGM, you are legally allowed to do so until the agenda is issued. I wanted to put motions up for our AGM and when I called to find out what the deadline was, I was told it had passed as they were now compiling the agenda. I said fine, that means the agenda hasn’t been issued so you have to accept my motions.
Wish I hadn’t though – it wasn’t so much an AGM as the Battle of Little Big Horn with me playing General Custer.