Table:
0
A
B
C
D
E
F
1
Year
Date
Event
Days
Stages
Acts
2
1990
18 August
Monsters of Rock
1 day
1 stage
5 bands
3
1991
17 August
Monsters of Rock
1 day
1 stage
5 bands
4
1992
25–26 July
One Step Beyond
24 hours
1 stage
60+ DJ's
5
1992
22 August
Monsters of Rock
1 day
1 stage
6 bands
6
1994
4 June
Monsters of Rock
1 day
2 stages
12 bands
7
1995
26 August
Metallica: Escape from the Studio
1 day
1 stage
9 bands
8
1996
17 August
Monsters of Rock
1 day
2 stages
13 bands

Questions and formulas:
Question: When was the Metallica: Escape from the Studio show?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="metallica: escape from the studio"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,C2:C8="metallica: escape from the studio"),2))
Level: medium
Question: When is the Monsters of Rock show with 12 bands?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(C1="monsters of rock")*(F1="12 bands")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,(C2:C8="monsters of rock")*(F2:F8="12 bands")),2))
Level: medium