Table:
0
A
B
C
D
E
F
1
Round
Main date
Number of fixtures
Clubs
New entries this round
Prize money
2
Extra Preliminary Round
16 August 2008
203
761 → 558
406: 356th–761st
£750
3
Preliminary Round
30 August 2008
166
558 → 392
129: 227th–355th
£1,500
4
First Round Qualifying
13 September 2008
116
392 → 276
66: 161st–226th
£3,000
5
Second Round Qualifying
27 September 2008
80
276 → 196
44: 117th–160th
£4,500
6
Third Round Qualifying
11 October 2008
40
196 → 156
none
£7,500
7
Fourth Round Qualifying
25 October 2008
32
156 → 124
24: 93rd–116th
£12,500
8
First Round Proper
8 November 2008
40
124 → 84
48: 45th–92nd
£20,000
9
Second Round Proper
29 November 2008
20
84 → 64
none
£30,000
10
Third Round Proper
3 January 2009
32
64 → 32
44: 1st–44th
£75,000
11
Fourth Round Proper
24 January 2009
16
32 → 16
none
£100,000
12
Fifth Round Proper
14 February 2009
8
16 → 8
none
£200,000
13
Sixth Round Proper
7 March 2009
4
8 → 4
none
£400,000
14
Semi-Finals
18 April 2009 19 April 2009
2
4 → 2
none
Winners: £1,000,000 Losers: £500,000
15
Final
30 May 2009
1
2 → 1
none
Winner: £2,000,000 Loser: £1,000,000

Questions and formulas:
Question: What was the main date of the round with 20 fixtures?
Formula: LET(query1,SUMMARIZE(B1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)=20))
Formula2: LET(query1,SUMMARIZE(B2:B15,SUMX(C2:C15)),FILTER(query1,CHOOSECOLS(query1,2)=20))
Level: hard
Question: What were the new entries for the Semi-Finals round with fewer than 8 fixtures?
Formula: LET(query1,LET(query1,FILTER(A1:F1,A1="semi-finals"),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,3)))),FILTER(query1,CHOOSECOLS(query1,2)<8))
Formula2: LET(query1,LET(query1,FILTER(A2:F15,A2:A15="semi-finals"),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,3)))),FILTER(query1,CHOOSECOLS(query1,2)<8))
Level: hard