Flight
If you opt to take the ferry, this takes about 3-5 hours (depending on the type of ferry) and can be booked here. Of the ferry sites I've looked at this one seems the easiest to figure out, provides clearest options and good prices. It is also the one recommended by Aelia Villa. There are three ports in Athens and the largest is Piraeus. The websites have warned that this is a popular route and ferries get full so encourage people to book in advance though I really don't know if that is true or not
Train
If you're looking to explore other islands after departing Paros this website might be helpful in assisting with ferry transport. Looks like you can get to Santorini in 3 hours for 18 euro!!
Flight
I have found the best prices for flights on this app for years and again we have found the best prices on here for the flight from Athen to Paros (approx $80). When looking to book the flight from US to Athen and from Athens to Paros this is a solid place to start.
Hotel
Upscale hotel near the villa where we will be hosting the post wedding dinner and several guests have already made reservations. We are already in contact with the staff and they are willing to offer a discounted rate by contacting Katerina directly at reservations@saintgeorgehotel.gr rather than booking online. Let her know that you are with our wedding party :)