[Excerpted from] Revised March 2017 Guidelines for Selecting Outside Speakers Diocese of Sacramento Parishes, Movements, Apostolic Groups, Catholic Schools
As a general rule, the invitation of any speaker or honoree should be an opportunity to evangelize and catechize the faithful. Thus, anything which may cause confusion or scandal or incite to disrespect or dissent is to be avoided.
Remember that when a speaker is assessed, Diocesan Statute #81 must be followed: Any speaker who publicly promotes or advocates views which are contrary to Church teaching, may not give a talk, retreat, workshop, course, etc., at Church related events, or on church, school or diocesan property in the Diocese of Sacramento.
Likewise, anyone who publicly promotes or advocates views which are contrary to Church teaching may not be given awards, honors, or other marks of public recognition.
Full story at dioceseofsacramento.org.