You are expected to post at least once a week. Don't be surprised if I jump in and comment.
It is important to remember that your blog is going to be your "guideline" for your parent teacher conferences. You are going to want to start uploading photos of your work, discussing your research, posting questions for readers, reflecting on new things you have learned about yourself and your ideas, etc.
Please review the rubric carefully; if you keep up on your blog, then going through parent/teacher conferences should be a breeze.