Table:
0
A
B
C
D
E
1
Race Title
Circuit
City / State
Date
Winner
2
Oran Park
Oran Park Raceway
Sydney , New South Wales
20 - 22 Apr
Tony Ricciardello
3
Queensland Raceway
Queensland Raceway
Ipswich , Queensland
25–27 May
Tony Ricciardello
4
Eastern Creek
Eastern Creek Raceway
Sydney , New South Wales
13 - 15 Jul
Tony Ricciardello
5
Mallala
Mallala Motor Sport Park
Adelaide , South Australia
12 - 14 Oct
Tony Ricciardello
6
Sandown
Sandown Raceway
Melbourne , Victoria
7 - 9 Dec
Tony Ricciardello

Questions and formulas:
Question: what day was the sandown
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="sandown"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,A2:A6="sandown"),4))
Level: medium