Русско-англо-русский юридический словарь

Insured event: An uncertain future event that is covered by an insurance contract and creates insurance risk. (IFRS 4 Insurance Contracts)

A contingent liability is a potential liability that may occur, depending on the outcome of an uncertain future event. (Investopedia)

In that context, in my opinion, the expression "contingent creditor" means a creditor in respect of a debt which will only become due in an event which may or may not occur; and a "prospective creditor" is a creditor in respect of a debt which will certainly become due in the future, either on some date which has been already determined or on some date determinable by reference to future events. (Wikipedia)