Well I think only one calls it "primitive", and the rest call them "muzzleloader seasons". So look for muzzleloading seasons on the internet.
Good luck though as some states have decided a single-shot modern rifle with a "straight walled" cartridge also fit their new definition.
BTW remove "open" prior to "iron sights" as when you include "peep" sights, that's contradictory.
"Iron sights" are any sights that don't use an optical enhancer, and you might want to think about some sort of "vision waiver" for folks who can get an eye doctor to sign off on such, as our group is aging, and you might be defeating your purpose before you start. I'd suggest, if you were in my state, since they allow bow to the end of January for deer, that they allow the muzzleloaders as specified above, to that same end date.
LD