Attempts to ascertain whether any Slovak political representatives commemorated June 21st at Sliač were unsuccessful. The date appears to have passed without official recognition or visits from public officials. The text indicates a search for evidence of remembrance was conducted, but no such evidence was found. Sliač is referenced as the location of significance, implying a historical event or memorial exists there. The author expresses disappointment or notes the absence of official acknowledgement. The lack of commemoration suggests a potential oversight or a lack of priority given to remembering events associated with Sliač. Further context regarding the significance of June 21st and Sliač is needed to fully understand the implications of this absence.