Q. See question 4074 above. If Rosh Chodesh Shvat is so important and auspicious, should one make an effort to do a wedding or a Vort on that day?
A. Some Poskim maintain that one should avoid getting married on the first, third and fifth day of the month (Sdei Chemed 21, Sidur Shaar Yisoschor and others).
However, the common tradition is to be lenient (Darkei Teshuva 179: 14 and others).
Horav Shlomo Miller’s Shlit’a opinion is that in our case it is preferred to celebrate on Rosh Chodesh.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a