A friend of mine did this for about 80 people: Free for the guests: - soft drink and beer from kegs - barbecue A bunch of musician friends brought instruments and put on a little one-afternoon festival after the ceremony, which took place under a tree decorated with flowers - each guest brought their favorite flowers to make it feel visually rich. It all took place in a public park with a small pub/restaurant nearby, so anyone could buy additional drinks and food.