Who has done that before and knows how it works?
Can I and how would I buy 'memberships' to use for tournament prices, before I make the tournaments (kind of 'in spare')?
I would - for example - like to buy and pay two rook memberships now (of course, _with_ the easter egg bonus) and keep them somewhere 'stored' until I make a tournament maybe next month, and then use them as prices.

Is that possible? Or do I have to make the tournament first, add the price, buy it, and then they are stuck with that tournament?