HI there! I used to pump when my daughter had her first morning feeding of the day. I would just pump on whatever breast she was not nursing on & eventually I built up my supply by doing that. My breasts would both be very full in the morning & I make it part of my routine. I would set up the pump at night with a fresh bottle and be ready to go in the morning. Make sure you keep well hydrated throughout the entire day. I also used these herbal supplements which helped a lot. If you can get the pills & not the liquid it's easier and the liquid tastes disgusting, so the pills are best
http://www.motherlove.com/product_more_milk_plus_veg.php
I don't need them anymore, but did use them for a few months. You can find them at Whole foods & while some say they are pricey, they are cheaper than formula.
As far as when you go back to work, if you pump as much as you nurse during the time you are away from your little one, you will have plenty for him. I would sometimes get distracted and miss a pumping session, but if you get into the habit of that your supply will go down.
For the wedding, just make it a priority to pump when you can. Preferably as close to the amount of times you feed the little guy. However, if you miss a pumping session or two it is only one day and it's not worth the stress. You might miss a dance a bouquet toss, but don't miss pumping altogether.
I wish you lots of milk and a stress free transition to work/wedding. I remember those days! You will get through it like a champ. Also, make sure you are getting a good amount of rest when you can. Even if it means that once a day he gets formula and you are okay with that. A rested mommy is a mommy filled with milk! Good luck!