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Invite people who you are comfortable and/or close with. Do not invite acquaintances just to fill up space at your party. Text/email your list of close friends to find out if they are free. Consider the group dynamics for an outing.
This includes the people who both love you and who you really love. Make a list of your friends and friends that you would like to share your special day with. The people who come are going to be the most meaningful part of your special day. Twenty somethings report that there are 8-10 people who they feel close enough with to share emotional support. Thirty somethings give the number between 5-10, typically. Write down a list of the people who you feel that support from. You may want to let your close friends bring a friend or two. This might make the group more diverse while also keeping it a more intimate and meaningful celebration. Facebook makes it easy to invite a great big group of people to a get together. However, it can be difficult to estimate how many people will truly come. Additionally, being around many acquaintances on your birthday that you do not feel very connected to can end up making you feel more lonely on your birthday. This is not to say that there can be no acquaintances at your party. Having a few acquaintances there might be good for the group because they are new people. However, be intentional about the acquaintances you invite, and only invite a couple of people you do not know well. Do this about four weeks before your event. Tell your friends what day(s) you are thinking of getting a celebration together and ask them if/when they would be free. Ask them what days and times work best for them. Based on who responds and when they are free, you can start to think about what to do. If you want the group to be a little bigger, ask your friends if they would like to bring a friend or two to the outing. Ask them to get back to you when they know whether they will be attending alone or with a friend so you can plan accordingly. Talk to a couple of your closest friends. Tell them that you want to have a birthday celebration with your close friends. You can start to brainstorm who would be the best to get together for a celebration. You want to make sure that the group dynamics will mix well, and your friends might have good input for how that can work out. Consider having two different celebrations for you birthday. You can get brunch with one group of your friends or family in the morning, and go out for dinner and dancing with the other group, for instance.