Assuming you mean the next meet in October 2014, the dates are 10/16-10/18, it will be over by the 24th. Next April is 23-25th. The first day of the meet (Thursday) opens at 12 noon for the meet, but I think you can register before the opening bell.
All the information regarding the meet you could want (including future meet dates) is here.
There is no concern regarding proving your membership before showing up to the meet, as you can join right there(though it will cost you extra ($20 instead of $12 in advance)to attend when you pay admission at the door instead of in advance) .
If you wish to join before then so you can get the benefit of publications, TCA member website, etc, you have plenty of time to do so now.
No more 2 signatures required.
-Dave