What a beautiful dream! It seems rich with symbolism and emotions. Let's break it down:

1. Setting in a European opera theatre: This could symbolize a desire for romance and the finer things in life. The opera often represents drama, passion, and deep emotional experiences, suggesting that you may seek meaningful connections and experiences.
2. Watching Swan Lake: Swan Lake is a story of love, transformation, and sacrifice. This may reflect your hopes for a relationship that is both enchanting and profound. The ballet could also symbolize the elegance and grace you desire in your life and relationships.
3. Your attire and his suit: Wearing a floral gown indicates a sense of beauty and femininity, while your boyfriend's grey suit might represent his practicality and seriousness. This contrast could reflect your appreciation for both romance and the realities of life.
4. His workaholic nature: The fact that you admired his work ethic rather than feeling frustrated suggests a deep understanding and acceptance of his character. This may indicate a desire for balance in your own life—acknowledging ambition while still valuing personal connections.
5. The proposal: The proposal moment is significant; it symbolizes commitment and the desire for a deeper bond. The cue cards could represent preparation and thoughtfulness in expressing feelings. Your contentment when saying yes highlights a sense of fulfillment and readiness for a new chapter.
6. Celebration with family and friends: This shows the importance of community and support in your life. Their presence suggests that you value the opinions and presence of loved ones during significant moments.
7. Clapping from the audience and dancers’ courtesy: This reflects a sense of recognition and celebration of your love story. It suggests that you believe your relationship deserves acknowledgment and that it brings joy not only to you but also to those around you.
8. Backstage and cocktail reception: This part of the dream points to your desire to connect more deeply with your partner and the world around you. It signifies a wish to celebrate accomplishments and enjoy the fruits of your relationship in a social setting.

Overall, this dream seems to highlight your desires for love, commitment, and a supportive partnership, while also recognizing the importance of personal ambitions. It may be helpful to reflect on your current relationships and whether they align with these dreams and values. Embrace the beauty of these aspirations as you continue to navigate your path in love and life.