Churches sometiimes offer buffet lunches or afternoon teas if you pay their catering committee. Church halls are often fabulous and village churches have sizable gardens for photos. Hire a photographer.
It is traditional but saves money.
Then all go out to the local large pub's function foom, or the golf club, bowls club, RSL club with a set menu of not too many choices and home made wedding cake. (saves money)
Provide alcohol and soft punch with the meal but no spirits.
Hire a fairly local band that plays covers and have taped music too.
It is cheaper to have a week day wedding but every single guest has to take a holiday and lose pay.
Don't go too late. Make your own favours like small jams or chutney..
Alternatively hire a mobile roast caterer to a country hall, after a garden or church wedding.
Have cheese and fruit boards. If it is going into the late of night, hire the local kinder committee or sports club or make cheese toasties for supper or order pizzas in. Make food and freeze it - cup cakes, cheese sandwiches for toasties, savoury muffins. Well chosen taped music is better than no music.
Have a small wedding but a larger reception at home with a BBQ and salads and make your own pavlova bar.
Or have a large day wedding, a tasty afternoon tea or mocktail hour with speeches at the church and only have a very small number invited to a sit down wedding breakfast. Fewer than 20 people will be easy to book at many venues..
Cheaper food often means a very limited menu .. prawns (peel your own) soups, pasta, lasagne, trays of sushi for a wedding breakfast. Along with stand up baskets of asian curries and fried rice etc. bowls of strawberries in season.
Set up pots of tea and make your own coffee.