According to a news report by Naver, BTS have been given an invite to the 2018 iHeartRadio Music Awards, which is scheduled for March 11. It's actually not that big of a surprise because they have been nominated for two awards, Best Fan Army and Best Boy Band. Even EXO has been nominated for Best Fan Army.
So far there has been no word from BTS or Big Hit Entertainment but many fans are hoping BTS will be able to attend the iHeartRadio Music Awards. After all, BTS does have a good track record with U.S. music programs (see Billboard Music Awards - they won top social artist - and American Music Awards - where they performed their chart-topper DNA - along with many other performances and interviews on shows like Ellen and Jimmy Kimmel).
Even if they don't perform, just have them come and show their amazing faces as they take away all the awards.