Only the City of Anchorage has a ballot curing (correcting) process, and the deadline to correct a ballot is no later than 4pm on the day the canvassing board meets, which is on or before the third Friday after the election. If the signature on a ballot return envelope is missing or is deemed invalid, election officials will send you a letter explaining what happened, and you will have to fill out a form and direct you to return it or come to the location in the letter and present a valid ID to sign a verification form.