OK, I can't quite make out what days you can train from your post. List that and I can make better suggestions. Also, will you only be doing the shotput and discus and will meets always be on Thursdays?
Anyway, in-season training is a balance act really. You have to 'peak' weekly for games/meets but you need to retain the foundation throughout since the really important games/meets don't happen until the end of the season. I would advice you to work on your sport-specific skills in the weight room the day after meets. That means push presses or split jerks on Friday. You might also throw in a squat combo which means you superset regular (heavy) squats with
squat thrusts. For your discus you could do medicine ball rotations (be careful) to strengthen your core laterally and also do some side wood-choppers (down and up).
There should be no weight work on the day before a meet. If you feel you
have to workout make it a light one. It's a mistake to try and
gain strength in-season. At most you should work on improving your explosiveness and just retain strength. If you're interested in being a good athlete that is.
So, any heavy work for your body should be done on Monday and Tuesday (regular strength workouts). Optional light workout on Wednesday (
do not try regular intesity for this workout). No workout on the day of the meet and sport-specific work on Friday. But, with more info I would probably be able to make better recommendations.