Make a new page on the event and make sure it is parallel as well. Then make a conditional branch if [event item] is in inventory, right under [else] in that conditional branch, insert the command Change Items, and select your event item then click OK and place your event wherever you want on that map. Add as many change item commands as you want, but I recommend never putting just gold as part of what it gives out as you can't restrict its distribution unlike items. So if you absolutely want to give out gold, make sure an item is being given as well. Because if they have the event item in their inventory, it won't let them get the gold again neither. But that still can be abused if they want the gold instead of the item because it can be traded to other players.