Welcome back Pam! I'm so glad to hear you like the Moms Panel. We love to help guests answer Disney vacation planning questions, so I'm glad you're back with another question!
Most of
Disney's Port Adventures will meet just after the ship docks in the morning. Some adventures have multiple times to choose from, but that would be noted when you book that adventure, as you'd need to choose your time. If there isn't a choice, it will most likely be in the morning.
Many adventures will actually have meet up points on the ship itself, so you simply go straight to your specific spot, say, the Walt Disney Theatre, and meet your guide and group there, then walk off together and head off on your adventure. A few others might meet just off the ship at the port. If your adventure includes water time, you will find towels waiting for you to pick up at your check-in spot as well, so no need to bring your own.
When you arrive in your stateroom the first day, you'll find tickets for each Port Adventures you've reserved. Those will list the exact meeting spot and time.
Hope that helps, Pam! Keep the questions coming as you continue to plan!