Event Hacking question

So to in actuality i'm looking for the event 11B4E (CB/1B4E -CA000), correct? Its the event just prior to the coin flip scene where Setzer puts Celes in the room and says he'll come back later. This should make Umaro visible because the event is already defined by previous coding, correct?

It's not the event that display Umaro but the appearance bit. The event is what is happening when you talk to Umaro like a dialogue or the movement of the character or any other action. You'll have to code your own but it can be only a dialogue box showing with some text. Now you're saying you want Setzer to put Celes in the room when you talk to Umaro?!?

Edit: If you're doing this only for testing purpose, it may lead to a game crashing depending what is in the event you're giving to a NPC, e.g. a character that is not not there and require to be.