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Dear Diana,

Thank you so much for your letter! I'm so excited to hear about your costume party. It sounds like a lot of fun! As for your questions, here are my recommendations:

1. Regarding your experience as a host, yes, I did. It was great experience!
2. As for the food, I think you should serve some finger foods that are easy to eat while people are dressed up in costumes. Maybe some mini-sandwiches, fruit skewers, or vegetable platters.
3. For music and decorations, I would recommend something that matches the theme of the party. If it's a Halloween party, go with spooky decorations and music. If it's a superhero party, go with bright colors and upbeat music.

I hope this helps! Let me know if you have any other questions. I'm so excited for your party!

Best wishes,
Your Russian friend