“Well, Severus? What message does Lord Voldemort have for me?”
“No—no message—I’m here on my own account!”
-- Dumbledore and Snape (DH33)
Where Severus Snape met with Dumbledore to warn him that Voldemort was going to attack the Potter family because of the partial prophecy he overheard at the Hogshead (DH33).
J.K. Rowling signed a collective letter in 2015 against any cultural boycott of Israel as reported in The Guardian. When fans criticized her stance due to human rights infractions made by Israel, insisting that Harry Potter himself would disagree with her, Rowling explained her position through an essay via Twitlonger entitled "Why Dumbledore Went to the Hilltop" referring to the location where Dumbledore met with Snape (JKR:Tw).