Hi there @Blueciferr
You can do this, do it being aware that these types (gambling, giveaways, lotteries etc) of trades are not supported in PRO, therefore should things go wrong in relation to the trades, Staff will not get involved - assuming it doesn't crossover with an existing rule in another way. Any and all actions you and any participants take is at their own risk.
I would also urge you to take some precautions:
Host it on the forum in General Game Talk, since this is not an exchange in the way that threads in the Trade Zone are.
Screenshot all related in-game conversations, and post these within the thread.
Make sure all rules are clear and available: I am happy to go over your draft and identify any loopholes or shortfalls.
Make sure that involved players know and understand that their involvement is at their own risk.