Fair & Square

                Menorahs at Fairs & Squares

According to the 1) Minchas Yitzchok, 2) R Y. S. Elyashiv
3) R. S.Z. Auerbach,4) Klausenburg Rebbe 5) R.S. Wosner,
6) R.N. Karelitz 7) R. E. Waldenberg  zt"l & להבדיל בין חיים לחיים
8) R. Ch. Kanievski & 9) R.M Sternbuch Shlita,
 
Lighting a Chanukah Menorah in front of the City Hall, Parliament
buildings, top of cars or other public places, etc. is not the Mitzvah
of פירסומי ניסא that Chazal instituted.

Those who do light there with a ברכה are עובר on  ברכה לבטלה.

Harav Hagaon Ovadya Yosef zt"l argues on the above and holds
if they Daven Maariv at those public gathering it gets the status
of a Shul and one may be lenient and make a Bracha.

The Chasam Sofer avoided lighting the Menorah in Shul
because he was uncomfortable making a Bracha there.