This photo is from a college initiation or something?

that's a public event
 

Nope. But thanks for it either. (of course, initiation pictures are worth very much)

No, it's an undie run:

https://forum.oneclickchicks.com/showthread.php?t=183634

Fango

How can we see the large size pics of these attachments?

For the one that says "Attached Thumbnails" just click on it; sadly, for the ones that say "Attached Images" that's the only size available, at least in the post: to get bigger ones, you'd need to do reverse image searches on them (and, as a further pain in the patoot, it won't work via url, but only if you save the image and then use the "Upload an image" option)...the somewhat better news is that that gives you results like the one below, and additionally that most if not all have been posted many, many times at OCC, more than a few in the "Some new initiation pics" thread at https://forum.oneclickchicks.com/showthread.php?t=69443