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Blowing Shofar on R”H not for the purpose of fulfilling the Mitzvah:
On Rosh Hashanah one is only allowed to blow the Shofar in order to fulfill the Mitzvah or for practice for that day. It is forbidden to blow it casually or for practice for the next day. It is however permitted for children to practice blowing the Shofar on Rosh Hashanah even for no need at all. See Chapter 2 Halacha 22 for the full details of this matter!