I would be showing TICA first then GCCF the next week - but I would be showing different cats.
I have to inform GCCF that I am showing at TICA because my cat is registered with both organisations so they would know that I had shown with TICA the week previous.

Regarding the weekend shows if I did a 2 day TICA show then if you count 13 days from the Monday (as Sunday is a show day) then you would be unable to show until 2 Sundays later.

eg, TICA show 1st & 2nd November count 13 days from 3rd Nov that takes you to 15th Nov so you would be able to show on 16th or is that not how it works?

I only want to do TICA because my bengal will get full recognition there unlike the assessment classes with GCCF