Novus Ordo Seclorum has three events that still have tickets available. Although listed as LRP, these are really just expansions of our style of Call of Cthulhu focusing on role playing. Call of Cthulhu players should be completely comfortable.
"Leo Song" was played in 2014 and was the single most loved of all our events. It is a long form event from one of our best GM's involving a complex plot and many NPC's.
"Vampire Ball" is a new event from another of our premiere GM's. It uses homebrew rules but again should be very easy for our players.
Take a look and see if these might interest you - you won't be disappointed!