Congrats on the engagement! I got married the day after my last final in May. There was a 2 1/2 week break until the summer semester began, leaving enough time for a one week honeymoon in Riviera Maya. Taking a week off during school is just not an option. We flew out the morning after the wedding. A plan like that may not work for you. Consider the fact that I'm a male, and that I had little to do with planning the wedding. Even then, it was still stressful and definitely affected performance evals. My wife was in grad school as well, so it was extreme stressful for her. However, we had the wedding near our hometown and let her mother plan out the entire thing with input since she's good at that type of stuff. We also had 11 groomsmen and 10 bridesmaids to help out when needed (most lived pretty close). If you're going to have a big wedding, make sure you have the support system and everything will turn out great. If you're planning it on your own, I'd consider what Steph suggested and seperate the honeymoon.
A lot of people asked me why not wait until after school? The way I see it, you develop good spending/budgeting habits since income will be limited. You learn to support each other through stressful and adverse times.. If you can survive that, it makes 5-10 years down the road all the more enjoyable. And plus all that emotional gushy stuff.. All the best!