You should conclude the speech in the similar flow used during the speech. The essential thing to note down is that ending the speech is important. It needs to take an attention of the audience till the last hour. The informative speech should cover all the procedures and ideas focusing on the topic. Better to start with a larger image and convincing points that you are confident to speak on. For an instance, work on the subjects that you usually do or love to do.
That said, your parents' disapproval of your future mate puts you in a sticky situation. Be really honest with yourselves about these three questions, and you will be in a good place.
Think back on your relationship history.