Over here in England, large increases in insurance premiums and health and safety compliance issues have caused the demise of a number of smaller events.
The trend now seems to be for 'Live History Events' featuring a full range of periods and reenactment societies from Iron Age to WW2 gathering to spread the financial commitments.

Has direction of interest Stateside changed? I went to assess a Greyhound as a prospective foster (due to owner's demise) this week, and got talking to the Son who makes armour and accessories for Medieval fairs and HEMA events who says most of his demand is from the US; more orders than he can cope with.