A real life event that was early.
An early point in a real-life process.
Sooner than expected.
Preparedness.
Arriving early for something can represent: the perceived importance of whatever you were early for in the dream, feeling extra-responsible, eager, or impatient about something in your life, a feeling or fear of your timing being off somehow in your life.
For more clues, consider the motivation for and your feelings about the earliness.
See Also: Before, Age, Time Frame
[1]If you dreamed of being early for something, you need to cut back on your spending.
[2]See Also: time
[3]