Important caveat: Nevada is a closed caucus for both parties.
You have to be already a registered member of the party you want to caucus for.
But I don't think there's a time limit on when you register though. AFAIK, you can register for the party in question on the day of the caucus.
No, according to Wikipedia you have to already be registered by the day of the caucuses, there is no same-day registration.
Sorry, can you clarify where on Wikipedia it says that? And do you mean that you have to be registered before caucus day both as a voter
and as a member of the party? And if so, what is the deadline for both?