Q. Dear Rabbi. Can one prepare and schedule trips and recreational activities for the Three Weeks?
A. One shouldn't schedule trips and recreational activities for the Three Weeks. However. some maintain that if that is the only time a person can take trips with his family, or it is for medical reasons, it is permitted until the Nine Days.
See Mikroei Kodesh 5:1 quoting the Masas Chaim of Rav Chaim Palagi that the rabbis of his generation established that people shouldn't go on trips during the Three Weeks. He also writes that this is cited by the Sdei Chemed Ben Hametzarim 1:10 and Nitai Gavriel Ben Hametzarim 23 fnt. 7. He also quotes that he heard from Rav Shaul Yisraeli that one shoudln't go on recreational trips during the Three Weeks. See also above Mikraei Kodesh 5:1 citing Rav Mordechai Eliyahu.
Rabbi A. Bartfeld as revised by Horav Y. Hirshman, Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu, Horav Kalman Ochs, and Horav Dovid Bartfeld consulting in need Horav Hagaon Rav Yitzchak Berkowitz Shlit’a