I agree with Lise. When I get invited to parties or get-togethers, I like to find out how many people are going to be there. Some times, they tell me what kind of people are going to show up like there are so many couples and some are family and some are close friends, etc.
When we get invited to family get-togethers, for example, yesterday's bbq, they told me who was going to be there by saying "so and so has to pick up so and so"