Session Modality and Conference Attendance
Individuals can submit both in-person and virtual proposals. In other words, submitting one proposal using one modality does not require all other submissions to be in the same modality (i.e., you do not have to submit all your proposals using the same modality).
Individuals can present in (and attend) both virtual sessions and in-person sessions if they register for the in-person conference. However, individuals who register for the virtual conference can only present (and attend) the virtual conference. Any session with a virtual presenter must be entirely virtual (even if some of the speakers are in-person).