Each college has at least one college representative who should allocate a time and place to drop off the clothes, just drop them an email if you don't know where or when your college collection is taking place. 

"My college doesn't have a representative listed!"- Don't panic! We're in the process of finalising them and the page will be updated as soon as possible afterwards. 

"I live out, can I still get involved?"- Yes! Just email your college rep to sort out how to get your clothes to them.