Lost dark blue floor-length formal dress with attached sequins and satin finish at Brunswick Park near picnic tables.

I lost a beautiful dark blue formal dress at the Brunswick Park on Saturday during the evening event. It's a floor-length gown with attached sequins and a satin finish, size 6. I believe I might have dropped it near the picnic tables while unpacking my things. I would really appreciate it if someone found it as it holds a lot of sentimental value for me.