Found some 'cup hooks' at the drug store after work, filed one down with my multitool to make it even skinnier, stuck it on my wall, and I've finally got my lovely calendar hanging on my wall! ...So what if it's may already. >_> I have literary pin-up girls.
And fortunately calendars are light so I don't have to worry about the weight pulling the hook off the wall and I don't have to worry if it damages the paint, because it's already damaged from the posters I had in high school (even if the strips I used to hang them claimed that they would not damage paint
).
Next up: hanging curtains.