Which group attended sporting events at the turn of the 20th century apex

The group that participated in sporting events at the turn of the twentieth century was a group of men, women, children, and anyone interested in sports.

Explanation:

At the height of the twentieth century, the practice of sports became very popular and many people were interested in some sport. As the twentieth century was a more modern and inclusive century, there were no restrictions when playing men-only sports where neither women nor children could participate. At the height of the twentieth century, anyone with an interest could choose the sport that they liked best and participate in it. For this reason, we can say that the group that participated in sporting events at the turn of the twentieth century was a group of men, women and children.

the answer is mass marketing.