Who organizes nominating conventions?

In United States politics, a brokered convention (sometimes referred to as an open convention and closely related to a contested convention) can occur during a presidential election when a political party fails to choose a nominee on the first round of delegate voting at the party's nominating convention.

Explanation:

if you have to make a general question and respond to your thoughts, then this isn't really a question someone can you on. read the passage, form your question, and answer using your thoughts. no one else can understand how you interpreted this text if you don't tell us.