Table:
0
A
B
C
D
E
F
1
Year
Date
Event
Days
Stages
Acts
2
1980
16 August
Monsters of Rock
1 day
1 stage
8 bands
3
1981
22 August
Monsters of Rock
1 day
1 stage
6 bands
4
1982
21 August
Monsters of Rock
1 day
1 stage
6 bands
5
1983
20 August
Monsters of Rock
1 day
1 stage
6 bands
6
1984
18 August
Monsters of Rock
1 day
1 stage
7 bands
7
1985
17 August
ZZ Top: Rocking the Castle
1 day
1 stage
6 bands
8
1986
16 August
Monsters of Rock
1 day
1 stage
6 bands
9
1987
22 August
Monsters of Rock
1 day
1 stage
6 bands
10
1988
20 August
Monsters of Rock
1 day
1 stage
6 bands

Questions and formulas:
Question: Tell me the date for acts of 6 bands and year larger than 1981 for monsters of rock
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(F1="6 bands")*(A1>1981)*(C1="monsters of rock")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,(F2:F10="6 bands")*(A2:A10>1981)*(C2:C10="monsters of rock")),2))
Level: medium
Question: Tell me the stages for 1981
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1=1981),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,A2:A10=1981),5))
Level: medium
Question: Tell me the event for 6 bands
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="6 bands"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,F2:F10="6 bands"),3))
Level: medium