A particular activity or task in a dream can represent that actual activity in your life (usually something you've done recently or is on your mind for the future).
Also, very often, an activity represents something completely different, but with some similar characteristic. For instance, dreaming that someone steals your keys often means you're feeling like you're losing your self-identity, or that someone or something is "crossing your boundaries"—or you're afraid they will.
An activity in a dream is almost never a prediction of a real life event—so dreaming that you're a guest on Jay Leno doesn't mean you should brush up on your witty conversation. Much more often an activity represents your feelings during that activity in real life recently, or a fear or hope of something like that happening in real life, or the subconscious might be exploring what it would be like if something like that happened.