SELECT "Date" FROM table_51742 WHERE "Crowd" > '15,601' AND "Away team score" = '13.13 (91)'
On what date did the away team score 13.13 (91) in front of a crowd larger than 15,601?
CREATE TABLE table_51742 (
    "Home team" text,
    "Home team score" text,
    "Away team" text,
    "Away team score" text,
    "Venue" text,
    "Crowd" real,
    "Date" text
)