Who, When, Why, and How Many...
points given: +10
reason: for scoring full marks on the Gilderoy Lockhart test
notes: She was the only student who knew Lockhart's secret ambition is to rid the world of evil and market his own range of hair-care potions
teacher: none, it was Percy
points taken: -5
reason: Ron, talking back while Percy was reprimanding him for sneaking around Moaning Myrtle's bathroom, said Percy only cared whether Ron messed up Percy's chances of being Head Boy
notes: Conflicts with OP statements that only teachers can award or dock House points. Percy had been a prefect for over a year; he'd know perfectly well what he could and couldn't do with his authority.
- Gryffindor: totals not given, but plus 400 at the last minute to secure the Cup