Effective marketing techniques for NPOs include everything that any progressive business would use, with one special qualifier:  go for free publicity whenever possible.  Also, social media offers a dozen ways to reach possible donors, customers and volunteers at no cost except the time it takes to make it happen.  Joint ventures open additional possibilities whether you partner with another NPO or a for-profit business.  Use your imagination and don't be afraid to ask.  Since you are not asking for something for yourself, it is easier than selling when it's your job.  See Matthew 7:7.