What do you do at a caucus?

1. A meeting of the local members of a political party especially to select delegates to a convention or register preferences for candidates running for office.
2. A closed meeting of party members within a legislative body to decide on questions of policy or leadership.
3. A group within a legislative or decision-making body seeking to represent a specific int
4. A meeting of the local members of a political party especially to select delegates to a convention or register preferences for candidates running for office.
5. A closed meeting of party members within a legislative body to decide on questions of policy or leadership.
6. A group within a legislative or decision-making body seeking to represent a specific interest or influence a particular area of policyerest or influence a particular area of policy

Generally regarding the caucus process in the US Presidential elections, to participate at the "primary caucus" just show up and sign an oath that you voted for a candiate of the party who's caucus you are attending. It's easy, and fun!