The Three Weeks falls out in the middle of camp season, and camp trips are often an integral part of the summer program. Rav Shmuel Halevi Wosner was asked (Shevet HaLevi 10:26) if it is proper for camps to take children on trips in the three weeks before the nine days start.
He answered that from Shiva Asar B’Tammuz until Rosh Chodesh Av, “Yesh LiMa’et Ktzas B’Tiulim”, the trips should be somewhat minimized in order that the children should recognize that these changes are because these are days of mourning. In the event that trips are made, they should become a Derech Mitzva by discussing Divrei Torah and Chizuk the entire way.
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