How to make own title of the part of text?

Question

I'm trying to create titles for pieces of text that won't appear as the last element at the bottom of the page. I haven't been able to find a method to prevent page breaks directly below the title. How to do this?

Code:

\documentclass[12pt,titlepage,twoside]{book}
\usepackage[paperwidth=30cm,paperheight=11cm]{geometry}
\usepackage{lipsum}

\newlength\meetingtopsep
\setlength\meetingtopsep{2ex plus0.8ex minus0.5ex}
\newcounter{meetingno}[section]
\renewcommand\themeetingno{\Roman{meetingno}}
\newcommand\meeting{
    \vspace{\meetingtopsep}
    \refstepcounter{meetingno}
    \begin{center}
        \large{Meeting \themeetingno}
    \end{center}
}

\begin{document}
\section{ABC}
AAAaaa
\meeting
\lipsum[2-2]
\meeting
\lipsum[1-1]
\end{document}

Answer 1

You can define it as a heading so latex takes care of avoiding bad page breaks, I defined it to be level -1 like \part so it's not really in the normal sectioning heirarchy.

\documentclass[12pt,titlepage,twoside]{book}
\usepackage[paperwidth=30cm,paperheight=11cm]{geometry}
\usepackage{lipsum}

\newlength\meetingtopsep
\setlength\meetingtopsep{4ex plus0.8ex minus0.5ex}% increased as no longer adding `\begin{center} space
\newcounter{meetingno}[section]
\renewcommand\themeetingno{Meeting \Roman{meetingno}}

\makeatletter
\newcommand\meeting{% you need this %
                      \@startsection{meetingno}{-1}{\z@}%
                      {-\meetingtopsep}%
                      {2ex \@plus .5ex}%
                      {\normalfont\normalsize\bfseries\centering}%
                      {}%  
}
\makeatother
\begin{document}
\section{ABC}
AAAaaa
\meeting
\lipsum[2-2]
\meeting
\lipsum[1-1]
\end{document}