I'd look around for startup-networking meetups in your area. I've been to Seattle Startup Drinks on a number of occasions, and there are plenty of more "business-side" people that show up looking exactly for us--I didn't even have any interesting ideas to share, but when they heard I was a dev, I was instantly one of the most popular people there.
Same as what xxr said below. Meetups.com usually will list informal or formal get togethers. Could also email your local startup association/incubator and ask. They may know of people hanging around or coming out of a startup and are looking for a new project. Also check out reddit subs /r/startups and /r/entrepreneurs I see a lot of "marketing experts" on there, however I would take anyone on the internet claiming to be an expert or a "growth hacker" with a grain of salt.
I was thinking a part time marketing job would be an ideal gig for a woman who's looking after young kids, has experience and wants to work 5-20 hours a week on something interesting to keep their eye in. I'd look in those circles.