Which item will stay/disappear after Summer Sideshow end?

I want to ask developer, if I collects these items, which will disappear? which will stay?

I just want to know...

List -

1. Weekly Rewards
2. Season Rewards
3. Ticket Rewards
4. TragicKingdom
5. Zed skins

Is the sun symbol item only can use in Summer Sideshow?

The rocketman helmet didn't has sun symbol , is it a item will not disappear after summer sideshow?

The weekly rewards will disappeared too?

Which item will stay/disappear after Summer Sideshow end?