On Monday evening, December 23, from 6 to 8 p.m., Preservation Oklahoma will host a holiday open house at the Henry and Anna Overholser Mansion. The public is invited to join in the festivities! This open house is a wonderful opportunity to appreciate the beauty of this historic home and to meet the newest member of the Preservation Oklahoma team, Shelley Bierschank. Shelley serves as the Museum Director and Volunteer Coordinator at the mansion. She will be offering paid tours…