I'm not sure if you know how to do this... (I dont), but last year the FE coordinator put a link in his signature line to a google document spreadsheet. We could just link to it at any time to see the updates. it was quite convenient. i know personally, i'd like to know, even this early on, the number of participants and ages of kids particularly, so i can keep my eyes open for goodies and start making things now. I don't want to pressure you though, so whatever works for you is fine. It's just a suggestion.
I'm sure whatever you do will be fine. we all appreciate you coordinating!! last year our cut off was a month prior. we called it a "soft deadline", allowing for late entry under the understanding that some people may be unable to include them at that late date. They would participate with those who could accommodate them. It worked well. and fortunately we all were able to accommodate all the late-comers.
I would like some input though, as far as what everyone has in mind in terms of gifting. meaning... one delivery per cabin or per person or per day or once per cruise??? I know that it doesnt have to be set in stone and some people will do different things, i was just hoping to get an idea of what others had in mind. On our last cruise, i had planned on gifting to every person every day. Then a couple weeks prior, our organizer decided to assign everyone 1 specific day to deliver. i really wished that had been decided WAY in advance!! It would've saved me alot of work and alot of money!!