Every nonprofit should take care to continually grow their list of prospective donors. I recently met with a client that held a successful outdoor cycling event, but neglected to collect e-mail addresses of attendees who were there to cheer on the cyclists. My heart sank when they told me. Why? It’s great to collect the e-mail addresses of direct event participants, but what about their friends and family who cared enough to come and cheer them on? Another example is your annual Gala. Sure, you have table sponsors, but you leave it up to the sponsor to provide you with guest names, right? Find a way to capture their e-mail addresses as well. Growing your list means higher probability of online donations next time you send that e-mail campaign appeal.