Use 'bedeck' when describing places or objects decorated for special events, like festivals or parties. The hall was bedecked with banners for the graduation celebration.
Pro Tip 2/3
Not Simple
'Bedeck' implies decoration that is rich or elaborate, not something simple or minimalistic. The Christmas tree was bedecked with ornate baubles, tinsel, and lights.
Pro Tip 3/3
Visual Attraction
Use 'bedeck' to suggest something is made visually attractive or eye-catching through decoration. She bedecked her hairstyle with delicate flowers for the summer parade.