Change \date to \event

beamerinnerthemehhubeamer.sty

@@ -32,7 +32,7 @@
       % Date
       \vspace{5mm}
       \begin{beamercolorbox}[wd=12cm,leftskip=3cm,#1]{date}
-        \usebeamerfont{author}\insertdate%
+        \usebeamerfont{author}\insertevent%
       \end{beamercolorbox}
   \end{textblock}
   \vfill

beamerthemehhubeamer.sty

@@ -14,6 +14,12 @@
 \definecolor{hhuorange}{HTML}{ee7f00} % Orange
 \definecolor{hhured}{HTML}{be0a26} % Rot
 
+\newcommand{\insertevent}{}
+\newcommand{\insertshortevent}{}
+\newcommand{\event}[2][~]{%
+  \renewcommand{\insertevent}{#2}
+  \renewcommand{\insertshortevent}{#1}
+}
 
 % Settings
 \useinnertheme{hhubeamer}

presentation.tex

@@ -6,7 +6,7 @@
 
 
 \title{There Is No Largest Prime Number}
-\date[ISPN ’80]{27th International Symposium of Prime Numbers}
+\event[ISPN ’80]{27th International Symposium of Prime Numbers}
 \author[Euclid]{Euclid of Alexandria {\small\texttt{<euclid@alexandria.edu>}}}