At my school pre-clinical electives are super chill - they are not for credit but you do get a little thing on your transcript, and if you fail or stop going it just doesn't show up so there's really no pressure.
I did a neurosurgery elective and it was pretty much "we'll feed you guys pizza once a week if you wanna come hang out and talk about cases, or follow us around in clinic/OR/etc." It was a good way to get early exposure to the field, and figure out that NS wasn't really my jam...
I say ask the upperclassmen what the time commitment is like, and go for it if you're interested.