With a CYA of 70, it is safe to swim with an FC as high as 28, so you are not even close to that. All is well. Now after your weekend events and swimming, keep an eye on the amount of FC used each day. You should not use more than about 4 ppm of FC each day (24 hours). If you do, then you might need to do a little work for the water or perform another OCLT just to be safe. Have a nice weekend.