Try to get them to all sir together by introducing each other, and making them friends. Or, alternatively, if that doesn't work, you could sit with one group one day, and the other the next.
in high school for lunch i hang with 3 crews, i made 2 recently who are girls,and 1 who are only boys, is it ok that i hang with the new ones first then finish lunch time with the boy crew.....life with just tooooo many friends?