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Before that date you can do whatever you want with the cards: trade, sell or buy in the market
On that day at 10:00 am PST they'll become untradable and unmarketable. You only will be able to craft the badge if you already had the complete set before expiration
I hope that answer your question
No. Seasonal badge is different, nobody really knows what happens with that badge, but from past experience, it possibly will be available to upgrade until just a couple of days before the summer sale (around mid July)