- - Attends a meeting, with "on"
- - Attends as a visitor (with "on")
- - Attends, temporarily
- - Attends class without credit.
- - Audits, perhaps
- - Jams with the band
- - Acts as a sub
- - Audits a course, say
- - Performs as a guest
- - Subs 21. Run-down area
- - Acts as a sub (for)
- - Audits, with "on"
- - Joins a jam session
- - Takes part temporarily
- - Observes, with "on"
- - Subs at bridge
- - Protests in a way
- - Takes part.
- - Participates (with "on").
- - Subs
- - Substitutes for
- - Subs for
- - Substitutes
- - Doesn't officially enroll
- - Participates
- - Unruffled
- - deputizes
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