Well, you can always post a sample capx, duplicate of the original with everything removed but what you need help on.
If you just add a condition "once while true" on your event 43, your problem will be solved though. The problem right now is that you don't have a trigger for the portal to appear, you just check if the time has passed. But as once the time has pasted, it has passed every tick, your condition is always true, thus the once while true.