How to include list environment in "titlepage"

Question

I've bee writing my own class for meeting notes, and I want to have an fbox with everyone who has attended the meeting, preferably in a list (itemize or my own custom list). Is there a way to do this in the title, so that the list is always rendered with the command \maketitle? I've seen plenty of variables defined in making your own "title page" (in quotes, because it won't be a page on its own), but no environments/lists.

MWE of what I'm after:

\documentclass{article}

\begin{document}
\begin{minipage}{0.6\linewidth}
  {\Huge Meeting}\\
  \today\\
  Start time: XX:XX\\
  End time: XX:XX
\end{minipage}
\fbox{
\begin{minipage}{0.4\linewidth}
  \textbf{Attendees}
  \begin{itemize}
    \item Member one
    \item Member two
    \item etc.
  \end{itemize}
\end{minipage}
}
%% End of the stuff I want the \maketitle command to create.
\end{document}

I want to know if it's possible to get the Attendee's included the same way title usually is e.g.

\title{Meeting}
\begin{attendees}
\item Member one
\item Member two
\item etc.
\end{attendees}
\starttime{XX:XX}
\endtime{XX:XX}
\maketitle

Any other ways of achieving the same thing in a class are welcome!

Answer 1

Here's one possible solution:

\documentclass{article}

\makeatletter
\def\stime#1{\gdef\@stime{#1}}
\def\etime#1{\gdef\@etime{#1}}
\def\attlist#1{\gdef\@attlist{#1}}

\def\@stime{\@latex@error{No start time given}\@ehc}
\def\@etime{\@latex@error{No end time given}\@ehc}
\def\@attlist{\@latex@error{No attendees list given}\@ehc}

\renewcommand\@maketitle{%
\par\noindent\begin{minipage}[t]{0.6\linewidth}
  {\Huge\@title\par\smallskip}
  \@date\\
  \begin{tabular}{@{}ll@{}}
  Start time: & \@stime\\
  End time: & \@etime
  \end{tabular}
\end{minipage}%
\fbox{%
\begin{minipage}[t]{\dimexpr0.4\linewidth-2\fboxsep-2\fboxrule\relax}
  \textbf{Attendees}
  \begin{itemize}
  \@for\temp@a:=\@attlist\do
    {\item \temp@a}
  \end{itemize}
\end{minipage}}\par\bigskip%
}
\renewcommand\maketitle{%
\if@twocolumn
  \twocolumn[\@maketitle]%
\else
  \@maketitle%
\fi%
}
\makeatother

\stime{08:00}
\etime{10:00}
\attlist{Member one, Member two, Member three, Member four}
\title{Meeting}
\date{\today}

\begin{document}

\maketitle

\end{document}

You provide the information using \stime (for the start time), \etime (for the end time) and \attlist (a comma separated list of all the attendees) in a fasion similar to the standard \author, \title commands. If those commands are not provided an error is generated and an informative text is shown in the output console and written in the .log file. Support for a two-column document has been also provided.

The relevant code is between \makeatletter, \makeatother since the example is a .tex file; those commands are not to be used inside a .sty or .cls file.