This post, for one, is helpful. I went and used all my allotment of upvotes today. I earned two badges in the process: Suffrage (0 votes), Vox Populi (all 40 votes cast)
It took a while, but it did clue me in on some helpful things.
Semi Stale 0 Questions. Look at some semi-stale questions (over a week old, or on page 2 of the questions list) for some 0-voted questions. Read. If it was asked well, if the person provided details, upvote. Note: I didn't upvote popular questions.
View Tags for my currently-working-on areas. Search for tags for areas I'm working on right now. Review all 0-vote questions. Upvote.
Answers to the above: Reading answers to the above. I upvoted answers,  even if they were not marked correct as long as they were good, specific and thoughtful contributions. [EDIT Note: I was asked about this in the comments. Sometimes there's more than 1 way to solve an issue, or the issue is still in process, but good dialog is happening. That's the kinda answer that gets my vote.]
I just happened to notice, on the Badges Earned page of the site, that Badges I just earned today are at the bottom of count of total Badges Earned.
I certainly became a bit more aware of good Q and good A in the course of my under-an-hour-long foray earning my badges. I predict that may change my behavior the next time I return to look for answers to some Q I have. As in browse, click, read. yep, good question, upvote. Good answer, upvote. Repeat.
So maybe what we need to do is some variation of this:
- Earn your Suffrage Badge!
- Earn your Vox Populi Badge!
- Help the EESE site get over 100 Suffrage Badges by August 31!
- Help the EESE site get over 100 Vox Populi Badges by August 31!
Emphasize the group total, and as people help the site get that many badges, you'll have sent that many more people through the process of thinking about quality Qs and As as they upvote.
Heh. And being a member of the most exclusive club of Earned Badges gives one certain bragging rights. Gauntlet Thrown.