Help needed on a mixed race portrait photo

I have been asked by a friend to take 35mm images at his wedding rehearsal
and dinner.
The wedding is a mixed race wedding and I wish to know if I should set the
camera to
a +1 or 1-1/2 exposure due to the lack of control over lighting and setting
to account for
the difference between the light and dark skin pigments that will be
together in the shots
thus keeping some highlights in the fair skined while gaining some in the
darker skinned.

Help with any suggestions to improve the images would be greatly
appreciated.

To reply:
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