gotcha day
n.— «Another way some adoptive families celebrate their adoptions is to commemorate the day their child was placed in their home or the adoption was legalized. Some call this day “gotcha day” and they celebrate the day as they would a birthday or anniversary. Others actually celebrate this as a “family anniversary.”» —by Andrea DellaVecchio The Unofficial Guide to Adopting a Child Jan., 2000. (source: Double-Tongued Dictionary)