Obviate: [ob-vee-eyt] (from Dictionary.com)
–verb (used with object), -at·ed, -at·ing.
to anticipate and prevent or eliminate (difficulties, disadvantages, etc.) by effective measures; render unnecessary
[Origin: 1590–1600; < L obviātus, ptp. of obviāre to act contrary to, deriv. of obvius; see obvious, -ate1]
We ask all of our brides and grooms to fill out a list of the family photographs they require, to obviate the risk of forgetting something on such a busy day.