OK still going with a "Maybe" for now due to the issue of glass near the Oasis pool.The covered Oasis patios. We have one booked for a full day and we were considering the Feast for dinner before we go to the Halloween party that night. (We're not bothered about getting to MK at 4pm because we're not interested in waiting on lines for characters, and we have hoppers for plenty of MK time.)
You might want to call Private Dining a day or two before to ask if they can package your Twilight Feast without glass or if glass items are OK on one of the patios. I don't know the direct number but you should be able to call Polynesian resort at (407) 824-2000 and ask for Private Dining and ask about the Oasis Patio location.
Dave