We did this very thing and booked a slip at Scrub and took their ferry to Trellis/the party and back. That way you don't have to be concerned about getting to Trellis early and/or risk not getting a ball or room to anchor....you take your time and do whatever and pull into Scrub on your schedule. Great facilities...a little pricy since they don't offer a discount during the full moon party. That said - several places now have full moon parties so....for example....I believe Foxy's now has one. But, from what I've read, I would still do Trellis.