Working off the filled in nomination sheets...
This process can conveniently be done by house representatives, ie. students. One student reads and checks, one student enters the events.

Then Enter Via Competitor

Working from the Entry Sheet, locate each student in turn
Notice that I have sorted the table by Competitor name, and typed 'Kaus' to locate Kaushik, forcing the selection in the top row.

Then Add Events

Although you can drag and drop events onto the right hand table, the quickest way is to enter the Event Numbers and click Add as shown below.


Those events are instantly added to the student. Any events of the wrong age or gender are ignored.