I just re-read about the Tuesday pool party - perhaps you should wait until after the party to shock. In that case, pour 5 jugs 8.25% and be ready to add more. Test FC/CC twice daily (early morning and evening). Add bleach as needed to keep FC at 15. If it drops below 8, test / dose more often. FYI each jug of 8.25% bleach will add about 3ppm FC to your pool.
Don't add any more tabs to chlorinator.
I just noticed that you pH is a little low - Add a box of Borax (20-Mule Team - laundry aid). You won't get accurate pH readings while FC > 10.
Keep us posted.
P.S. Why do you cover the pool at night?
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