It is not formal although a bit dresser than going out for dinner at your local restaurant. Women can dress up almost anything with heels & accessories. I would NOT go in jeans. Men slacks & dress shirts up to a suit women dress pants & blouse to dresses... depends on the function.
Depends on the event that is taking place. However mother's day brunch is business casual type dress, no suits, but ties for guys and dresses for women
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