Best way is to go to the Adonis LA event yourselves and chat him up. Be very professional, polite, discreet, and low-key. Do a lapdance, tip a bit, and then politely ask if he is comfortable with private meets. Aspen is not new at this at all and will know what he's willing to do.
Do not write to Matt about whether Aspen does private meets! He is not a pimp! Admittedly, Matt probably does arrange things at times for trusted, long-time regulars at his events, but something like this is between you and Aspen only.