When there are no bidders, or when the amount offered is grossly inadequate, when from any cause the sale is prevented from taking place on the day fixed, when requested by the judgment creditor, or when the parties so agree, the officer may postpone the sale without being required to give any further notice thereof, which postponement shall be publicly announced at the time the sale was to have been made, but not more than two such adjournments of not more than sixty days in the aggregate shall be made, except by agreement of the parties in writing and made a part of the return upon the execution.