Table:
0
A
B
C
D
E
1
Game
Date
Opponent
Score
Series
2
1
May 14
New Jersey Devils
1–4
Devils lead 1–0
3
2
May 16
New Jersey Devils
4–3
Series tied 1–1
4
3
May 18
@ New Jersey Devils
4–2
Flyers lead 2–1
5
4
May 20
@ New Jersey Devils
3–1
Flyers lead 3–1
6
5
May 22
New Jersey Devils
1–4
Flyers lead 3–2
7
6
May 24
@ New Jersey Devils
1–2
Series tied 3–3
8
7
May 26
New Jersey Devils
1–2
Devils win 4–3

Questions and formulas:
Question: what series was on may 14
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="may 14"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,B2:B8="may 14"),5))
Level: medium