What about “ADVANCED?”
A few classes may use this word instead of a number. This is a change from when we referred to these class types as “Level 4.” To attend an advanced class, you should be able to jump right into all rhythms and strumming patterns, be able to handle a bit of finger style, play some chord melody, know multiple chord positions, and be able to read at least a bit of tablature and/or notation.
If you’re not quite there and still want to attend, please sit at the back or sides and take the position of a passive observer. Please allow advanced students to ask questions to best use the allotted time.