Similar deal here. My dad is supposed to fly to Utah from Canada to visit for 3 weeks March 24th. We only see him every 2 years or so, and this year I planned it so I could bring him to his first and my favorite pinball show. So I've already bought an extra plane ticket to TPF and a pass for him. He's 79. Being Canadian he gets his share of colds, flu, etc but is also pretty sturdy. Sturdy but not stupid. So we're talking about it and waiting and seeing.
Frankly if half the crowd doesn't show up it wouldn't be the worst thing. TPF has become "pretty" crowded the last couple of years where the crowd you expect on Saturday is already there Friday evening. But this year is/was shaping up to be the best TPF in a long time. Reveal city this year. Gah....