If someone is in the year of Aveilus after a parent, can they travel to Eretz Yisroel for a grandchild’s wedding? 

  You're allowed to go to the wedding. If you don’t usually travel overseas to your grandchildren‘s weddings, you should not travel now either.   See here at length: https://asktherav.com/what-parts-of-a-wedding-am-i-allowed-to-go-to-during-the-year-of-aveilus-i-have-a-first-cousins-wedding-who-i-am-very-close-with-and-would-like-to-go-even-for-short-while/…

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