Is there anything that implies that a "host" (noun- e.g. host of an event) is a male? Is there anything preventing a female from being host (as opposed to a hostess)?
In context: An organization holds a weekly event. One of several representatives from the organization hosts each event, and both genders are in the group of potential hosts. Thus, is it sufficient to say "please contact your host..." or would this be inappropriate considering some of the representatives are female?