The trendy and iconic place for Bar Mitzvahs in Israel is on the top of Masada. You can connect it with a trip to the Dead Sea and also it's a more private event than near the Kotel: they have some space for the ceremony and mostly tourists are not coming close. But I don't advise this option for summer and, honestly, it's much harder than organizing a more classical way in Jerusalem Old City near the Kotel.
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