It's against Airbnb terms to have parties or events at properties you rent for residential use @Keaton18
although I can see why you want to do this to save money most Airbnb's are only set up to cater for the number of guests staying at the property
nothing stopping you from inviting family and friends to stay at an Airbnb that you book to stay at for your wedding within the guest numbers for that Airbnb and hold the ceremony and have additional guests at a venue set up to cater for weddings @Keaton18