not quite a meetup, but for anyone interested, every year my friends do a pub crawl the first night so the adults can meet each other. here's the info:
A Finding Nemo themed pub crawl! We will hit 5 bars, including Cove Cafe, Promenade Lounge, Fathoms, Keys and O'Gills Pub. At each stop there will be Finding Nemo trivia, and the winner of the trivia will receive a $50 Disney Gift card, compliments of our cabin! You do NOT have to drink to join the crawl and play the trivia! Anyone (21+) is welcome! Pub Crawl starts at 10pm at Cove Cafe on the first night of the cruise!
it's a ton of fun, even if you're not a drinker (i grab a virgin pina colada which basically lasts me the whole night

), and a good way to meet everyone you've been chatting with on the dis and other social media.