How do staff identify the show?
In the tehatres I ahve worked in the Perf Code has consisted of a Show identifier, date and a Time slot (normally M(atinee)/E(vening)) in whichever order they chose.
As a data techie I always wanted to go with full date YYMMDD plus an hour of day (0-9 a-m to cover 0-23) leaving 3 slots available for space and/or event indicator
This makes sense to me because it sorts by date and time and you have the choice of whether space/eventis more important than date or vice versa. ie D(ate)H(our)S(pace)E(vent), EDSH, ESDH, SEDH, DSEH, DESH and this preference would come down to that first question. As are you looking for the Space, Date or Event first.
The only reason any of that matters is because perf code is the more easily viewable unique identifier and is often used in drop downs so having a natural flow to it makes it easier for the people seeing/using it on a daily basis.
Mark