normally the event-shop is avaiable 24h after the event ends, so you can collect till the end and then spend what you earned. Yesterday I planed to collect some more tickets in the evening but sadly my ill child needed some exra care in the evening so I had no time for this. As I now went to the shop this morning to spend the tickets, they are all gone. Very annoying, I had something around 41.500, now I have zero.... I invested a lot of time for this. Would be nice, if you could reopen the shop for the 24h we are used to.