In the past,the person who made the invitation to a prom was responsible for paying the night’s cost.However,it is becoming more and more common for couples to share the expenses of the evening,one of the reasons of that maybe because today’s proms are much more expensive.When the couple decide to go to the prom,they should come to a mutual agreement of how the cost should be handled so that both people can budget for the event.The cost of the whole night may include the meal,the tickets and transportation.Usually,the gentleman of the couple should hold the money and pay for the bills if it is necessary on the evening of the prom,and this will avoid the awkwardness of both people digging through their wallet or purse to produce half of the funds required.