promposal

Etymology
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Noun

 * 1)  An invitation, especially one which is made in an elaborate manner, in which the invitee is asked to accompany the inviter to a prom.
 * 2) * 2012 April 22, Beth J. Harpaz, "‘Prom-posal’: Clever, elaborate prom invite, Washington Times / AP (retrieved 25 April 2013) :
 * Rebecca Leet, 17, had an audience of more than 250 people for a prom-posal from her boyfriend, Joe Nelson, 18.
 * Rebecca Leet, 17, had an audience of more than 250 people for a prom-posal from her boyfriend, Joe Nelson, 18.