Norma,
With seven rounds, each couple must meet with 21 other couples (3 per month) and so it must be the case that some couples meet more than once.
In the schedule below each couple meets with 17 of the other couples once and with the remaining 2 couples twice.
5 2 17 7
15 19 1 6
3 18 14 9
4 10 8 16
13 20 11 12
5 9 2 18
3 6 13 16
10 1 12 14
8 19 11 7
4 17 20 15
9 3 11 4
12 16 19 2
5 10 6 17
13 15 14 8
18 20 7 1
2 7 10 13
5 3 12 15
18 19 4 14
9 8 6 20
17 16 11 1
2 6 11 14
10 20 3 19
4 13 1 5
18 8 17 12
16 15 7 9
2 8 1 3
13 19 9 17
10 11 15 18
14 20 16 5
4 6 12 7
6 18 16 13
20 4 15 2
10 12 9 1
19 8 5 11
17 14 3 7
The couples who meet twice are
1 : 10 12
2 : 5 7
3 : 9 14
4 : 15 20
5 : 2 17
6 : 13 16
7 : 2 17
8 : 11 19
9 : 3 18
10: 1 12
11: 8 19
12: 1 10
13: 6 16
14: 3 18
15: 4 20
16: 6 13
17: 5 7
18: 9 14
19: 8 11
20: 4 15
So for example couple 7 meets twice with couples 2 and 17, but only once with all other couples.
Hope that helps.
Ian.
