Question
If a Jew does something during the three weeks that is forbidden during that time (e.g. listening to music, getting a haircut), have they actually sinned according to Halacha? Is it a sin, just like violating Shabbos or eating treif are sins? Would the term ‘avera’ be applied to such an action? Is the intentional, willful violator of the three weeks restrictions required to make atonement?

Question
The Torah makes clear the punishment for failure to fast on Yom Kippur - kareis. Is there any punishment for refusing to fast on one of the other five fast days when one has no medical reason to avoid it?

Question
Some Poskim permit a Chamar Medina to be used on Passover if one can’t obtain wine for the four cups. According to the view it is a mitvzah to drink the fifth (I Believe from the Ran and maybe the Rambam), can a Chamar Medina be used for that as well? What about the view one doesn’t drink it but puts it for Eliyahu

Question
A relative of my wife is getting married toward the end of July. We looked on the calendar and realized this is during the three weeks. What we found out is they are Sefardi, and the Sefardi custom is that weddings may be held during the three weeks before the nine days begin. We are Ashkenazim. What do we do about this? Can we attend the wedding?

Question
Is lag b’Omer an actual Halacha chiyuv, or minhag? Is it permitted to fast or no on that day? If it falls out motzai Shabbat, is besamim not used due to neshama yesira?