Here are some possible interpretations and their translations:
* "Soirée" alone translates to "evening party" or "evening event."
* "Mon" is the French word for "my."
* "Soirée de mon" (evening of my) could translate to "My evening" or "The evening of my [something]" (e.g., the evening of my birthday).
To get a more accurate translation, please provide the full context where you encountered "soirée mon."