Items you missed out on, that you hope return.

It is better to create a new tab in the break between events, access to which was opened for 5-10 dollars. And in this tab, you can buy for donuts all previously released content. In addition, what was offered for real money.
The player if he wants, then pays the money and buys what he missed earlier.
And if he does not want to pay money, he waits for it to be reissued for free.