What are the different categories of officials at a Track and field meet?

That is a group. In field events, when there are a lot of participants, they will split them into flights. For example, if there are 20 girls in long jump, they could split them into 2 flights of 10....

Most meets are scratch, which means that there are no handicaps, i.e. everyone starts at the same position.

Their job is to make sure the event goes smoothly and without any cheating.

A 'heat' is a preliminary race in a running event where the the top 2 or 3 finishers qualify for another race and the others are eliminated. For example, if there were 32 entrants in a 100 meter dash...

They range from the marathon to the shotput. There are far to many to list.