What field event do they not have any other track and field events running at the same time?

Answer 1

It depends on the track and how much space is available, but the javelin and hammer are dangerous implements that travel a long distance and are very dangerous. People have also been killed with shot put and discus, but they do not travel as far as the javelin and hammer so their danger zone is not a large.

Answer 2

Javelin i believe because the javelins can go wayward onto the track.