Casey, the games start from 12pm onwards. So they can play only 4 consecutive games in one field given that they stop playing around 8pm. From your format, i came out with 15 games on the first day if each team plays every other team inside that group. 6 games from Group A with four teams. 3 games from Group B with three teams. 3 games from Group C with three teams. 3 more games from Group D with three teams.
   Either one or two leading teams from each group proceed towards the next day.
   Btw casey bro,  do you have any insider info about the fields?
--Cowboy