WeSeWriMo, which is run by the web serial community site EpiGuide, runs annually during the month of August. This will be its sixth straight year. WeSeWriMo was inspired by the ever-popular National Novel Writing Month (NaNoWriMo). But where NaNoWriMo challenges authors to complete a 50,000-word novel in a single month, WeSeWriMo is designed to be adaptable to the unique challenges and opportunities of web serialization. Just as web serials come in a wide variety of formats, genres, and release schedules, the goals WeSeWriMo participants can pursue are entirely customizable. The idea is that each participant can set their own targets, based on their regular output. The WeSeWriMo website suggests aiming for 150% of your regular output as an example target, so if you're used to releasing 4 episodes of your series in a month, try to write 6 episodes, instead, and add them to your backlog. Another goal could be to write 1,000 words per day for the entire month, or you could come up with something completely different to try for, as long as your target is "ambitious yet realistic".
In my own case, I've decided to set a couple of different types of targets. I normally write and post two 1,000-word chapters per week for Special People, but in my official registration post on the EpiGuide forums, I laid out the following three goals:
Goal #1: Write 15 chapters (15,000 words)
Goal #2: Outline the next story arc.
Goal #3: Prepare the first Special People book for release.
If you're interested in taking part in WeSeWriMo yourself, check out the official website.