[RMVX ACE] PREVENTING A PARALELL PROCESS EVENT FROM REPEATING

So this should be an easy fix, but I haven't messed with rpgmaker in awhile, so here goes;

I have a conditional branch for
if variable = 17,
then run event

but its paralell process I only want the event to run once.
I could turn on self switch A to get to another event page, but there are more than four other conditions like this I want under one event. Like if variable = 18, I want a different scene to run once and once only.

And in case it wasn't obvious I'm using a time-based system where events are called based on what time it is. Any general tips in this area or reccomendations for better sysytems would be much appreciated.

author=pianotm
Should be straight forward in any case. Erase event if you want to run once on the map, but want it to run again if you reenter. Set it to a switch if you want it to turn off permanently. If you want to turn off parts of the event, set those parts to switches or erase event.

Yeah I could do that but there will be multiple time-based events in one day and at least 14 days so I didn't want to create upwards of 100 different switches. I think theres a way to simplify this, though not sure how.