No need to be shy! Quality work is quality work, no matter when it is submitted, and earlier is usually better! If DO is going to give out free t-shirts, there's no reason to purposefully deprive yourself of them just because someone wrote a blog post.
The Julia Language [0] gets some spammy issues/pull requests as well (not only during October) and while we have the benefit of dozens of maintainers such that it's bearable, I definitely sympathize with the issues OP is dealing with. Opt-in could be a good idea, although as usual, the issue is scaling and verification.