Generic name for published documents which are designed to perform a specific task at a specific time, and expected to be forgotten or thrown away after use – although they might be retained for a striking design or as a souvenir of an event. Ephemera include posters, tickets, and leaflets. Does this blog count as ephemera? I don’t know.
These temporary documents tend to be littered with ‘linguistic shifters’ – relative terms such as ‘tonight’ or ‘here’ – which always require contextual information to make any sense at all.