The Democratic and Republican caucuses usually select delegates to support particular presidential candidates at their state convention, which will then assign delegates to the national convention. The Libertarians have a simpler process. To vote for a presidential nominee you have to be at the state convention.
That means being in San Antonio from 3pm Friday (delegate credentialing) to 5pm Sunday (the actual votes for presidential nominee). Sigh. That's a long drive from here, and a couple nights in a hotel. Even if I carpool and room share with some of the local libertarians that's still a whole weekend away from family and no writing time.
So, sigh, I will not be voting for Gary Johnson until November. And I'm hoping the LP convention delegates don't go nuts and nominate a talk show host.