If I remember correctly, nothing much happens until the first Senatorial District Caucus Meetings where you elect your permanent SD Chair and committee members. The Resolutions(party platform) Committee Member and the Rules Committee Members are the key people.
I have heard of 2 proposed rule changes:
1) A rule 43 substitution which would require all candidates for political offices to agree to a Core Party Platform(2/3 approval on Resolutions Committee)
2) A rule 44 which would close the primary to registered republicans only
There is much information on the proposed rule changes at http://www.gopgrassroots.com/ I have much more info on this too. Louis Kreusel SD 26, San Antonio