This is a key stage in the USA election process. Administered by the Republican National Committee, the main purpose is to nominate an official candidate in an upcoming U.S. presidential election, to adopt the party platform and rules for the election
for an example of the process of nomination see the Wall Street Journal.
The official website has an app where you can watch proceedings and get lists of speakers. The Twitter feed links to accounts of events.
The Republican National Committee has press releases
See the official 2016 platform which it adopted.
Updates are also on Twitter.