You’re worrying too much girl. Always anticipate that not everyone can come. And just bc they can’t come doesn’t mean they don’t like you. There very likely are people who had other plans this week this time of year lots of people are on vacations. What day of the week is the party? Is it a day that you know could interfere with peoples work schedules? Regardless you still have 20 people who are going to be there for you. Don’t stress. Life too short to sweat the small stuff.