There is the idea that the POW/MIA hat table or Missing Man ceremony should be brought outside for any remembrance ceremony.
The Premise
The whole premise for the POW/MIA Hat Table Ceremony, which you can find here, is for the table to be with and yet separated from other tables. The POW/MIA or Missing Man Table is set with an empty plate and glass for one to six settings in stark contrast to the place settings at the other tables for the people attending the luncheon or dinner. It is even appropriate for a breakfast, if need be, but the emphasis since its creation (see MCO 5060.20 and the League of Families website) has been a formal evening military dinner setting like a dining-in/out.
The Guidance
Don’t. The ceremony will always have meaning, even if you take the ceremony outside, but the context will be lost.