i would say it is a little too late in the day for a bunch wedding, so go with a lunch. it can be as easy or elaborate as you want.
1. pulled pork bbq and buns if people want to make them sandwiches along with sides
2.burger bar and sides
3.roast chicken and sides (similar to what in the south would be considered a traditional sunday lunch)
4.a variety of sandwiches, chips, veggies and dip, fruit salad, potatoe saiad, baked beans
5.chili bar and grilled cheese sandwiches or a variety of soups and grilled cheese sandwiches (esp for a fall or winter wedding)
Whatever you want to!! You can do a sit down meal (although I would suggest oping for the lighter meal choice offered), or a buffet.....maybe a 'wedding tea' with little sandwiches and cakes or scones?
There are no rules - your day, your way!!
I would also opt for the lighter side of things.