Can you still earn cards from the Monster Summer Sale?
When the Steam Winter Sale ended a section appeared on my badges page for the Monster Summer Sale, it wasn't there before the winter sale and I can't click into it to see the details for it like my other badges. If I click the play button it just takes me to the homepage of the store.
From what I've been able to find you need to have a level 8 steam account to get cards for this badge and my account is only level 4 so why did this badge show up? If I reach level 8 could still earn cards for it? Is it some kind of bug?
No, you are not able to earn cards for it anymore.
The fact that it is displayed is probably a bug.