I think that any of the lounges are open for meet/greets on sailaway day - there is a charge if you ask
DCL to help coordinate it. We've always had our meets in the Promenade Lounge on the first day and then maybe another one somewhere else later in the week.
Definitely sign us up as participants for Fish Extender. We're in Cabin 6116, two adults, two teenage boys. We've found that knowing what the traveling party is made of has been helpful for when we've wanted to personalize or perhaps modify fish extender gifts.
With all the traffic here on the thread, it's building my excitement. I filed our tax return today - wasn't sure how much we'd owe and told myself I absolutely could NOT peek at excursions until that was done - and it turns out we'll actually get $9 refund - LOL! Go figure, eh? So now I can go look at excursions this week!