Did you know (187)

The משנה ברורה קצ"ג ס:ק ט"ו says that at large gatherings (weddings etc.) you should choose a person with a powerful loud voice

to lead the Bentching (ברכת הזימון)

At weddings, it's usually done with a microphone. Many, aren't aware that Rav Y.S. Elyashiv and Rav Y.Y. Fisher zt"l

both hold that you are not יוצא אפילו בדיעבד.

Rav Wosner zt"l is lenient and holds that you are יוצא בדיעבד but writes "ומובן שכל מהדר במצות מהדר אחרי דיני לכתחלה"

(It is self-understood Those adorning Mitzvohs adorn the Mitzvah to be Lekatchila) 

Numerous people asked why 

ובנה ירושלים עיר הקדש במהרה בימינו   

Bonai =: The builder of Yerushalayim (incorrect-in L Hakodesh "the builder of Yerushalayim with mercy")

Boneh =: He builds Yerushalayim with mercy (correct)