A pair of artists’ works poignantly complement each other in the current two-person show at Area 405. Conventions, which pairs the installation and drawings of roycrosse with the sculpture and paintings of Ruth Pettus, maps a curious terrain where the past and world-at-large present coexist in a beguiling, sometimes disarming personal moment. Imagery of decay or violence gets reconfigured, and the results are strangely calming.