Dreams about mazes often symbolize feelings of confusion or being lost in a situation in your waking life. The indoor maze with a Christmas/Disney theme might represent a desire for joy and nostalgia, yet the queue indicates a feeling of being stuck or unable to move forward. This could reflect current life circumstances where you feel hindered or trapped, possibly by expectations or by the pace of life.

The act of shaving your head, especially since it's something you would never do in real life, suggests a desire for transformation or release. This could symbolize a need to shed old identities or burdens that you have been carrying. The blunt razor and uneven shaving may indicate that while you want change, the process is not smooth or satisfactory, leading to feelings of frustration or inadequacy.

Encountering people from your past and present in the maze could signify a need for connection or validation. Telling them you're shaving your head for charity shows a desire to justify your actions and avoid judgment, which might suggest you’re feeling pressure to conform or explain your choices in your waking life.

Finally, the long canteen area where others are gathered points to social dynamics and perhaps a fear of being judged or misunderstood by those around you. The moment the shaving foam touched your scalp and you woke up could indicate a sudden awareness or realization about your situation, or that you are on the cusp of a significant change but are still processing what that means for you.

Overall, this dream reflects themes of confusion, the desire for change, social pressures, and the struggle to take control of your own narrative. It might be helpful to reflect on areas in your life where you feel stuck and consider what changes you genuinely want to make.