Unless the reunion is made up of everyone fully vaccinated you may catch and carry the virus but be protected from any serious sickness. However, you may then pass it on to someone who is vulnerable and will become really sick if not worse Having said that, the question of one even getting the virus after fully vaccinated and passing it on, is an open question. Until the answer clearly says that a fully vaccinated person cannot pass on the virus to another-which may eventually be shown-we're just socializing with others who are fully vaccinated.
