This Halacha is an excerpt from our Sefer
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*All customs listed below are only practiced during the period of time in which one is accustomed to observe the mourning customs, as explained in the previous Halacha. For semantic purposes we will refer to this as “the mourning period of Sefira”. All mourning customs apply both to men and women unless explicitly stated otherwise!
It is permitted to make festive meals during Sefira even for non-Mitzvah purposes. It is however forbidden to dance during these meals or perform other extra forms of joy.
May one sing during a festive meal?
 Admur 493:1; Chok Yaakov 493:4; Aruch Hashulchan 493:2
Other Poskim: Some Poskim rule one may not make an over festive meal, such as a goodbye party or welcome party. [See Igros Moshe 1:98]
 See Piskeiy Teshuvos 493:4