Rick Riordan BookExpo America 2018 at the Javits Convention Center in New York City.

Rick Riordan BookExpo America 2018 at the Javits Convention Center in New York City.

Rick Riordan signs Katherine's books

Rick Riordan BookExpo America 2018 at the Javits Convention Center in New York City.

Picture has a red back ground with white words. The words are a quote attributed to Rick Riordan. Below the quote the words "Rick Riordan" ae shown in blue.

Rick Riordan also took the time to answer the question she's been unable to ask during the panel (why he chose Poseidon as Percy's father). (Because he liked the idea of him being descended from the second-most powerful god, not the most powerful one.) He was a really cool guy, and obviously loved interacting with the kids.

Rick Riordan signs Katherine's books

This is the logo of the Rick Riordan Task Force, under Wikipedia's WikiProject Novels. It consists of the Latin alphabetic letter 'R', Greek letter 'rho', hieroglyphic symbol for 'r' (also a symbol for 'mouth'), and the Norse rune 'raido'; followed by the words "The Rick Riordan Task Force".

This is the small version of the logo of the Rick Riordan Task Force, under Wikipedia's WikiProject Novels. It consists of the Latin alphabetic letter 'R', Greek letter 'rho', hieroglyphic symbol for 'r' (also a symbol for 'mouth'), and the Norse rune 'raido'; all contained in a box.

Rick Riordan signs Katherine's books