Do not leave it until the ceremony
The status and end date of a previous marriage can be important to a new Nikah. Relevant documents or details should be collected during preparation rather than discussed for the first time with witnesses already waiting.
Imam review
Talaq, khulʿ, annulment, widowhood and waiting periods can involve facts that need careful review. VidNikah gathers the relevant information, while the imam makes the religious judgement for the individual case.