Camp NaNoWriMo (https://campnanowrimo.org) takes place in April. It is run by the same group, and similar to NanoWriMo, except writers have more freedom. You can choose your own project. For example, you can choose to revise a manuscript, or choose how many words you’ll write that month.
I’m going to try Camp NaNoWriMo this time. I find that declaring my writing goals in public helps me to take them more seriously. My goal is to finish my current work in progress. I encourage all the writers out there to check it out.