If you do not have table linens, but don’t want to use the paper ones, sheets work very well as alternatives. Also, place some felt or other heavy material under your table linens so your tables will not be damaged by heat or moisture.
Take advantage of anyone’s offer to bring something for the party. Having many people bringing just one simple dish to share can save you a ton of time and energy. If your party will be all good friends and family you can even suggest they bring something with them if they have a signature dish that everyone in attendance just loves.
Decide if you will be making your own food or buying it prepared to save time. Some things, like veggie trays, meat trays, and even cakes can be purchased inexpensively from stores like Costco for about what you could make them for. Look at the actual costs as well as your time when you are making the decision.