i've had the lace skin unlocked for a while; i got it not long after it was introduced. since then, i have gotten the event for "unlocking" the lace skin while buying from sbq at least three more times. not sure why it's possible to still get this event when the skin is already unlocked.

Yep. There have been other boards about this from months ago, but it's never been fixed.

This happened to me as well.