COLORADO CITY, Texas -

A prayer vigil and balloon release is set for Saturday, Aug. 25, in Colorado City to observe the 15th birthday of missing teen Hailey Dunn.

The event is being sponsored by the group, Hope for Hailey.

Her actual birthday is Tuesday, Aug. 28.

Dunn was 13 when she disappeared on Dec. 27, 2010, from her Colorado City home.

On Monday, Aug. 27, she will have been missing for 20 months.

Here is Hope for Hailey's invitation on Facebook.

Here is Hope for Hailey's website.