Found 1 of the hidden event, by accident. Went to outside for a smoke, when I came back the "Spy on Zoe" was there.
This one popped when going to Megan's room in the morning, after Zoe told you Megan's "BIG" secret (Must see "Go in" option & wait 30 sec or so, "Spy on Megan" pops up)
**
do not use the map to goto her room, must exit your room then click on her door
After you've touched Zoe's boob the first time, & try to go back into the girls locker room, you should see "Zoe's taking a shower....." wait 20 sec or so "Go in anyway" pops up.
** you won't be able to go back in after she gives you a HJ.