How to understand "the first meeting of the first committee" and "the first party congress of xx city (county)"

Representatives of our Party Congress are elected every five years. The first elected representative is called the first, and the second elected representative is called the second. ...

However, each session of delegates has to hold several meetings, and now it is usually held once a year (a meeting usually lasts for several days, but it is always this meeting).

The first meeting is called the first meeting and the second meeting is called the second meeting.