You MUST provide acceptable documentation to support your unforeseen emergency withdrawal request. In-Service Withdrawals.Participants should attend a free Register to attend a Retirement Planning Seminar before submitting a distribution form. You MUST provide acceptable documentation to support your requested unforeseen emergency withdrawal amount. A participant in a section 457 plan may not withdraw the deferred amounts at any time prior to the occurrence of a payout event set out in section 457(d)(1)(A).