muman613,
What do you think about the idea of large free concerts in big cities. Jewish communities competing with each other to make even better and bigger concerts to bring in donations for a charity project.
This Tikkun Olam would create peace with non Jews and Jews. Very important step towards global Shalom.
The main problem is ignorance of the Jewish culture by the non Jews. In other words. Jews suffer from negative branding.
I think it is an interesting idea... But I don't really think it would change things much. Antisemitism runs deep and there are so many reasons {Oops I mean excuses} for it that even a very nice gesture like this would fail to change some peoples hearts.
First, many antisemites believe that Rock Music was invented by Jews in order to destroy the fabric of families. Second, if we have a multicultural event then the White Nationalists would accuse us of being multicultural minority lovers. There are other reasons I think it would not be as successful as you feel it would be but I will not go on about it.
I believe all Jews should do what they can to reach out to non-Jews whenever they can. But let me repeat one of JTF's main mottos which is that "ALL JEWS SHOULD LIVE IN THE LAND OF ISRAEL". This is a Torah command which says that a Jew should live in Israel in order to obey all the 613 commandments. So while it is good to have support from the host country which Jews live in, it is not the ultimate goal of the Jewish people.
When the Jewish people are free to rebuild the Temple and resume the service then we will allow the nations of the world to bring offerings to the Temple.
But for the short term I agree that there may be some good which comes from your idea...