First you need to ask yourself how close are you to all 8? I for example had people in my bridesmaids party that honestly, were mainly "fillers". When I realized I wasn't really close to 3 of the girls and was only including them because of family ties they went from bridal party to guest. Now if you are close to them and you wish an intimate party express this to them. You'd be surprised, Some might be relieved because they don't want to incur the expense but didn't know what to say to you.