How far in advance before an event should I expect to see the registration link? Mainly regarding Coaster Con 46 but I will apply the answer to all future events as well.

Usually registration opens mid to late April, though it can take longer to arrange all the conventions details with parks and venues, so it can open closer to the event. Information is available on the event listing for the months ahead. Schedule, hotel details so folks can book the host hotels if they want, and other event info. Registration for national events open up 1-2 months ahead of the event. Regional events can often open up much closer to the event date.