Here’s one way to accomplish what you want.
First determine how many practices/games have been played. In a cell E15 enter this formula =IF(COUNTA(E3:E13)=0,FALSE,TRUE) then copy across to V15. In A15 enter this formula =COUNTIF(E15:J15,TRUE) this will give you the number of practices. In B15 enter =COUNTIF(K15:V15,TRUE) this will give you the number of games. In A3 enter this formula =SUM(COUNTA(E3:J3)/$A$15) format as a percentage and copy down. In B3 enter =SUM(COUNTA(K3:V3)/$B$15) format as a percentage and copy down.
Hope this helps!
Gary