It is best to compose a poem about each of the guests themselves. But note that a poem, composed by the illiterate, obviously cutting ears, it's unlikely that they'll like it. The absence of at least one rhyme can spoil the impression of the whole text. If you do this, compose the so-called "white" poems in which the rhythm is there, and the rhymes are completely absent. Tell stories about not only the usual poetry, but about the other - "white" to the style of your speech was uniform.
Be sure to mention in the poem the guest's name and his profession. Tell them about what, in your opinion, he has good qualities.
If you do not wish to compose poems on their own, take the appropriate theme ready. Preferably, they also mentioned the profession of the guest. Slightly rework the poem so that it contained the name of him in whose honor it is being executed. Do not select for such an alteration too famous works.
Don't greet the guests with verses from the doorway. Wait at least until everyone sits down at the festive table.
In advance, select the family member who will read the poem. As a criterion for selection, use not only public speaking skills, but more importantly, a desire to be a reader. Do not be lazy to spend a few rehearsals. He have to learn the poems by heart and read them without hesitation. The presence in the hands of the "paper" is unacceptable. If the executor is a child, in any case, don't ask him to stand while reading in a chair, a stool - children perceive it as punishment.
In any case don't tell guests in advance that they will read poetry. Hide it from them until the very moment of their execution. If you do everything perfectly, guests will enjoy cooked for them a pleasant surprise.