>>4467625>>4467263Realizing I never replied, but the other anon is correct, most come from weddings.
Often they'll schedule something beforehand to have a printed book available as a surprise gift for an album. I've done one the morning of too, basically as part of the "getting ready". Otherwise, usually done as a gift for husband's birthday or anniversary present.
Weddings are great because you can get engagement, wedding, anniversary, maternity, family, etc all from one client. Weddings themselves also offer about the best opportunities from word of mouth you can get, from both clients and other vendors.