Dreams about needing to prepare for an important event often reflect feelings of anxiety or pressure in your waking life. The shower symbolizes a desire for cleansing or renewal, suggesting that you may be seeking to rid yourself of stress or negative emotions before facing a significant challenge.

The setting of the shower being in a large, complicated room implies that you may feel overwhelmed by the process of preparation. The darkness and thick spider webs represent obstacles or fears that are preventing you from reaching your goal. The webs, in particular, can signify feelings of entrapment or being stuck in a situation that is difficult to navigate.

This dream could be prompting you to address any fears or challenges you face as you approach this major event. Consider what aspects of your life might feel overwhelming or cluttered, and think about how you can simplify your path forward. It might also be beneficial to confront any anxieties directly rather than letting them linger in the background.

Overall, this dream suggests the need for clarity, focus, and perhaps a reassessment of the obstacles you perceive in your path.