Assertion: convention's member | /r/CapableOf | agree to be presider
Facets:
value: for more than two sessions
type: TEMPORAL
Source sentences:
text: A member who has submitted papers or agreed to be a respondent or a presider for more than two sessions must inform each session organizer, and the organizers should then indicate on their proposals (in the description of the session) who will replace the member if a replacement is necessary.