This is the 357th most frequent Hebrew word.
הפעילות
The activity.
In this sentence, "הפעילות" (hapə`ilut, the activity) refers to a specific organized event or set of tasks.
הפעילות היום כללה יצירה וציור.
The activity today included crafting and drawing.
Here, "הפעילות" (hapə`ilut) refers to the general ongoing activities or tasks at the school.
יש לך שאלות בנוגע לפעילות בבית הספר?
Do you have any questions regarding the activity at school?
In this context, "הפעילות" signifies the actions or efforts shown by the volunteers.