"Eager fans" refers to enthusiastic and excited supporters or followers of something or someone. They are eager because they are impatiently waiting for or really looking forward to a certain event, performance, or release. Full definition
Then on the weekend, the doors were open to readers and the floor was filled with lots of eager fans ready to meet some of their literary stars. (indiebookwriters.com)
Unfortunately, not all of them are good news for eager fans. (gamnesia.com)
The club is jam - packed with eager fans dancing with their hands up, but before you can join them you have a job to do. (nytimes.com)