"Attendance at" or "attendance of"

Should I use at or of in the following passage?

and through attendance [at/of] the regular video conferences has played an active part in ...

I guess my attendance at school could be questioned here, but perhaps through my attendance of an intensive English class I'd be able to figure out which one to use.


The use of at is certainly accepted with the word attendance. Of gives a connotation of possession (since it plays the role of the genitive), which isn't necessary here. So, at would be a better choice.