I successfully planned and got married whilst at uni. We got engaged when I was in my first year of college and we got married this April (in the middle of half term).
We are both now qualified teachers, my husband did a PGCE for secondary teaching, and I was doing a 3 year BA course for primary teaching.
My advice would be to make sure you get the balance right. We started planning when I was in my first year of uni, we got the main planning out of the way, i.e. venue, photographer, transport, cake. So we were left with smaller and less to do closer to the time.
Please just make sure that you don't let the planning take over your uni work. I probably could have done better with some of my work, (1 mark off a first for my dissertation!) but I let myself go into a dream sometimes.
Enjoy it, get the balance right and you will love every minute of uni and planning for your forthcoming nupitals