I just went day-by-day into July and starting July 5 it says "closed" and was not available to book. Is your res July 1-4? Maybe June 18 (original date) is now July 5.
We were there for dinner April 26 and our server said that yes, they were closing for a short while for refurb but would be open again 'for the holidays'. Not sure if she meant Memorial Day or Fourth of July. Disney is very good at getting in there and doing a fast refurbishment and opening back up. They surely have everything pre-planned and work around the clock, not like restaurants in the 'real world'. Unless you are looking for it, you will hardly notice various areas where they are doing this type of thing. I think that it also helps that Narcoosees is a stand-alone building... you have to purposely walk to it. So they will just erect some kind of scrim or facade, which is 'pleasing to the eye' as per Disney, and get on with it.
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