Coffee and Music at Java Cup

I want to bring a group of musicians Saturday February 23 . This will be a first experience for me . In order to plan and schedule everything accordingly I would like to know how many members will be interested in a such event. Please let me know , the more people will attend the better.. Thanks
The group is called Hot Spell they pay Jazz , Blues, R & B and Soft Rock and more There will be a cover charge of $5.00... That money goes to the band for performing... Sorry but I can not do it any other way Chafiq P #[masked]