After you've selected your location in the search bar you can filter the listings by Dates search. This will then only show boats that have availability in their calendar for those dates.
Remember that if you find a boat that isn't showing availability for a date you can always contact the Captain and ask. Here is a help article on how to contact Captains.
1.Click on "Dates" and select the day/dates you plan on going.
2. Click "Apply". This will show you boats that have available seats on the selected dates.
For mobile/tablet users:
2. Scroll down to "Dates". Select the day/dates and click "Show X boats". Boats that have available seats on the selected dates will be shown.