Number of people registered/spots available to register

Would it be possible to show the number of spots taken on a session and the number of spots left (i.e. 10/20) so 10 are sold and 10 are left to be taken.  We have many customers that are looking to sign up for the lower attended sessions but can't tell how many are allowed or left until it's almost full (doesn't show up until 5 or fewer spots left but that doesn't tell them how many spots were available.)