Trade system for events

I think their should be a trading system for events. Ex: Since you had to gamble in the iron crown event I unfortunately got 4 skins none of them being the one I wanted (centurion). I think their should be a option to trade a legendary event skin for another legendary event skin from that same event. Like since I got pathfinders skin from iron crown, I should be able to trade it for bloodhounds skin or for any other legendary from that event.