I agree with the suggestions above to start from the FargoRate numbers. Here is a general procedure:
For each group that you want to include, for example top women, start with mostly the top-rated players, and add a few popular players somewhat out of the top ratings. Suppose you want 8 women in the event. I'd invite the top 5 plus three fan favorites. My list would be:
Invited women planning for 8 (country and FargoRate shown):
Siming Chen CHN 790
Sha Sha Liu CHN 774
Chieh Yu Chou TWN 767
Xiao-Fang Fu CHN 764
Han Yu CHN 764
Chezka Centeno PHI 756
Jasmin Ouschan AUT 731
Karen Corr IRL 722
Be ready with some additional names of each kind if some invitations are declined. Ask for a quick commitment on the invitations so you can get the second round of invitations out.
My list of American men planning for 20:
1 Shane Van Boening USA 820
2 Mike Dechaine USA 799
3 Justin Bergman USA 794
4 Sky Woodward USA 782
5 Corey Deuel USA 778
6 Rodney Morris USA 778
7 Earl Strickland USA 773
8 Johnny Archer USA 771
9 Dennis Hatch USA 770
10 Oscar Dominguez USA 769
11 Josh Roberts USA 764
12 Billy Thorpe USA 763
13 Tony Chohan USA 759
14 Donny Mills USA 752
15 Jeremy Jones USA 749
16 Jeremy Sossei USA 748
17 Danny Smith USA 746
18 John Schmidt USA 740
19 Brandon Shuff USA 735
20 Mike Davis Jr USA 734
My list of international men planning for 32:
1 Jayson Shaw GBR 815
2 Jiaqing Wu CHN 814
3 Pin Yi Ko TPE 812
4 Dennis Orcullo PHL 810
5 Carlo Biado PHI 807
6 Jung Lin Chang TPE 807
7 James Aranas PHL 805
8 Niels Feijen NED 803
9 Eklenti Kaci ALB 803
10 Francisco Sanchez Ruiz ESP 803
11 Joshua Filler GER 802
12 Yu Lung Chang TPE 802
13 Alex Pagulayan CAN 802
14 Haitao Liu CHN 798
15 Johann Chua PHI 797
16 Lee Van Corteza PHI 796
17 Jeffrey DeLuna PHI 794
18 Ping Chung Ko TPE 794
19 Albin Ouschan AUT 793
20 Mark Gray GBR 792
21 Jeffrey Ignacio PHI 791
22 Lo Li Wen TPE 789
23 Warren Kiamco PHL 789
24 Hayato Hijikata JPN 789
25 Darren Appleton GBR 788
26 Alexander Kazakis GRE 788
27 John Morra CAN 787
28 Ruslan Chinahov RUS 787
29 Mika Immonen FIN 787
30 Francisco Bustamante PHI 786
31 Nick VanDenBerg NED 786
32 Ralf Souquet GER 785