If you need conditional presentation in a list, a continuous form and events are not going to do the job. In some cases CONDITIONAL FORMATTING will do the job, but only for appearance -- it can't do things like show/hide controls or alter the rowsource of dropdown lists or requery them.
Conceptually it would be impossible to do so. Form-level events fire for the record. Scrolling through the form does not move the record pointer.
I avoid using continuous forms for editing precisely because of this issue. Instead, I bind a detail subform to the PK value of the record selected in the continuous form, and then the detail form can do all the conditional formatting it needs to.