A raised platform on a stage for honored guests is known as a dais [pronounced DAY-ess or Dice].

This term may also come up when discussing flowers with  a florist; the floral centerpiece at the head table which drapes to the front of the table for visual effect is also identified as the dais.

Merriam-Webster Online Dictionary
dais (noun)
a raised platform (as in a hall or large room)
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