\documentclass{article}

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\makeatletter
\newcommand{\TITLE}[2][]{
  \begin{center} \Large \bfseries #2%
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\newcommand{\HEADING}{
{\noindent \small Structured Matrix Days 2019 \\
May 23--24, 2019 -- Limoges, France} \vspace{10pt}}

\begin{document}

\HEADING

\TITLE{Title of the talk}

\begin{center}
 \AUTHOR[1]{\underline{Author 1}},
 \AUTHOR[1]{Author 2}, and
 \AUTHOR[2]{Author 3}
\end{center}

Text of the abstract.

\KEYWORDS{keyword1, keyword2}

% Write the MSC2010 codes corresponding to your communication

%\MSCLASSIFICATION{Code1, Code2}



% Next include the references you need. 
% If your abstract includes no references at all, please delete all the lines
% from \begin{thebibliography} to \end{thebibliography}.

% Please, do not use more than 9 references.

\begin{thebibliography}{9}
  
\bibitem{ref1} \textsc{Auth1, auth2} Title \emph{Journal}, 15(3), 804-823 (1994).

\end{thebibliography}

\vspace{1cm}

\ADDRESS{1}{
Address 1
  \texttt{email address}
}

\ADDRESS{2}{
Address 2
  \texttt{email address}
}


\end{document}