The AGM must by law be held around the same time every year. No need to wait for the meeting notice. Just send any proposed motions to the secretary with a copy to the strata manager.
You cannot defer the election of the committee. It must be done at the AGM.
All common property must be kept in a good state of repair at all times under Section 62 of the Act. If it isn’t you can apply to the CTTT for an order that anything that is not in a good state of repair be fixed.
There is nothing you can do about proxies, other than preparing a detailed letter to all owners outlining your concerns. Unfortunately a lot of owners, especially investors, don’t appreciate how a well maintained building will protect their investment, and simply go for the cheapest short-term solution, usually meaning doing no maintenance.