Greek weddings can get pretty pricey, especially if you have a lot of guests and you're planning on getting married in the peak summer season. The best thing you can do is start planning your wedding early, so that you have time to shop around and see which vendors and venues will be the cheapest. Your wedding dress and suit will definitely be much cheaper if you buy it from Greece, so I do suggest that you get it there if you're able to get it done in time for the wedding. Outdoor venues also tend to be a lot cheaper indoor ballrooms. My last tip of advice, it's going to the destination that isn't so popular. If you want to get married in Santorini or Mykonos, your budget is definitely going to be much bigger in comparison to the mainland or Crete for example. Let me know if you have any more tips and if this helps!