CREATE TABLE table_79836 ("Year" FLOAT, "Stage" FLOAT, "Category" TEXT, "Start" TEXT, "Finish" TEXT, "Leader at the summit" TEXT)

Name the start of an event in Catagory 2 of the year 1947.
SELECT "Start" FROM table_79836 WHERE "Category" = '2' AND "Year" = '1947'
SELECT "Start" FROM "table_79836" WHERE "Category" = '2' AND "Year" = '1947'