Today i make a DAM Big mistake

today PBSM is 9am start.. and i dunno i thought is 8.00am so i 8.00am reach sch.. when i reach sch me and my fren , jie xi jus saw few ppls at thr.. and we thought today PBSM cancel.. me and jie xi wait until 9.00am then we saw alot ppl coming.. then only we noe.. today is 9am - 11am not 8am - 9:30 am = = wad a big mistake.. lucky didnt call my dad come fetch me at 9:30 am if not he sure Scold me cham cham...