Ask all of the girls at the party to divide into pairs (except the bride to be). Then ask each pair to write a poem about the bride and groom.
Make the poems as funny and witty as possible. Then ask each pair of girls to read out their poem to the party and ask the bride to choose the winning poem and award a prize.
Make sure to collect all of the poems and keep them in a special hens book for the bride to be to remember her hens party.