In the book Sand of the Arena, when the Quintus’ group comes for the “North-South” games to Pompeii, there are advertisement notices all over the place. Here is a transcript of notice posters from Pompeii, such as
Twenty pairs of gladiators belonging to Decimus Lucretius Satrius Valens perpetual flamen of Nero Caesar son of Augustus and ten pairs of gladiators belonging to the son of Decimus Lucretius Valens will fight at Pompeii on April 8,9,10, 11 and 12, there will be a beast hunt and there will be awnings. Aemilius Celer wrote this on his own by moonlight. (from LVDVS GLADIATORVS)
And like at modern sports events, gladiator related articles were sold.
Here are two examples, photographed by me in Cologne.
There are more images at the British Museum, Gladiators and Caesars with quality enlarged images.
And some on this Wikimedia page too.
Also here, halfway down the page.
