CREATE TABLE table_24777 ("Dates  ( MDY ) " TEXT, "Gross Sales" TEXT, "Tickets Sold / Available" TEXT, "Shows / Sellout" TEXT, "Sellout  ( % ) " TEXT)

Which specific dates encompass the time period when 'The Show Girl Must Go On' showed a gross sales figure total of $2,877,906?
SELECT "Dates (MDY)" FROM table_24777 WHERE "Gross Sales" = '$2,877,906'
SELECT "Dates (MDY)" FROM "table_24777" WHERE "Gross Sales" = '$2,877,906'