To dream that you are taking part in a talent show, indicates some feelings of insecurity or trouble with expressing yourself in real life.
The attitude and behavior of the audience will also guide you in how you think others perceive you.
(If they act rowdy and boo, you are quite insecure; if they cheer for you, your self-esteem is improving).
This dream also reflects your need to be the centre of attention and win approval from others.
Also see “Beauty Pageant” and “Karaoke.”