I’ve been there, Shawn! I’d go with twice a month as a minimum. Think of the rest as a bonus, and make sure the quality is there on every posting. I have 2 young kids of my own (3 1/2 & 1 1/2) & find that it’s helpful to schedule alarms on my phone during naptime or after the kids’ bedtime so I have no excuse not to get it done! I use holidays as topics of conversation all the time (post about sugar or candy on Easter, running on Marathon Day, turkey around Thanksgiving, beer on St Patty’s Day). I’d try to post a few weeks to a few days before the holiday when the hype is highest. Good luck!
I make sure I do about 6 posts a month from nutrition questions to exercises to fitness topics or news posts. That gets me a little under 2,000 hits a month. I than take the blog posts and put them on my facebook/twitter page. Its a great way to stay in touch w/clients and build up your “voice”. It’s also an awesome reference tool (including for you). Clients ask me questions and I send them to a pg on my blog.
Make sure you use key words and do consistent quality posts. That equals success!
Here’s my blog: http://thepilateshundred.blogspot.com/