Along with the bugsquashing day we could make a contest aiming to solve one especially annoying hard to fix issue.
The first coming to my mind, for example is the plymouth issue… hehe.
What I mean: to focus each time only on 1 given issue chosen in advance.
This contest can be played not only in IRC channel but also by email, bugzilla, forum or the tool we see better, and during several days until the bug is fixed.
The winner gets a small prize, and/or a special mention somewhere in our website.
In case, a funny contest name could be set. Kill that bug or smt in the lines.
If one don’t like the word “kill”, it’s just as an example