Just use a trigger with 0.01 delay that triggers itself and every time it goes to a checker to check whether the player has the item, to constantly check. When it passes, call meeting and remove item with item granter.
Just use a trigger with 0.01 delay that triggers itself and every time it goes to a checker to check whether the player has the item, to constantly check. When it passes, call meeting and remove item with item granter.