user: Question: what is the last performance of Leon Varkas Category:Articles with hCards
Columns: ['Performer', 'Performances', 'Category', 'First performance', 'Last performance']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Charles Anthony Category:Articles with hCards', 2928.0, 'Tenor', '03/06/1954', '01/28/2010']
SQL:

assistant: SELECT "Last performance" FROM "Table" WHERE "Performer" = 'Leon Varkas Category:Articles with hCards';