I texted, here is response. I had to clarify their response, it was a little unclear at first. And I do not think that the walkway on the causeway that is under the canopy is not used for the event. I think only the larger center area is used.
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When we have been there the walkways were not closed to guests or anyone for that matter. The food stalls were set up along both the causeway between S&D and the walkway between Swan and the main pool. People freely traversed the area whether a part of the party or not--note, you couldn't participate in the food items without the appropriate tickets, but the walkways and boat area were available to guests.
One year it stormed and the entire area was decorated and ready to go--the Classic pivoted and moved to the ballrooms at the Dolphin. They didn't even try to dismantle the area--all of the beautiful decorations and settings were ruined.
Wow! Thank you all SO much for this information! That makes a HUGE difference. I feel a little better now. I've been thinking a lot as to how to navigate back from Jollywood that weekend and now that the boat dock is available, it's pretty darn simple! Thank you!