Should one take part in the opening of an furniture exhibit during the three weeks, which will have festivities (including music, drinks etc), is located in a conservative synagogue centre hall and which will also be running over Shabbos certainly leading to more Hilul Shabbos.
I believe technically all three aspects would not be prohibited but would it be correct?
Thank you in advance
There is a problem of listening to the music. Perhaps there might be also a chilul Hashem aspect, that you are participating, supporting and condoning an event that is being held on Shabbos in a conservative hall.
O:CH 551 Mishnah Berurah 16. Teshvas Minchas Yitschok 1:111-4, Igros Moshe O:CH 1:21-4, Halichos Shlomo Bein Hametzorim 14:3.