\documentclass[portrait,a0,final]{a0poster}
\usepackage[final]{graphics}
\usepackage[margin=1cm,noheadfoot]{geometry}
\usepackage[usenames,dvipsnames]{color}
\usepackage{amsmath,amssymb}
\usepackage{rotating}

%% UC Colors
%\definecolor{headingcolor}{RGB}{248,152,0}
%\definecolor{titlecolor}{RGB}{0,35,185}
%\definecolor{grabcolor}{RGB}{7,147,0}

% Black
\definecolor{headingcolor}{RGB}{230,230,230}
\definecolor{titlecolor}{RGB}{255,255,255}
\definecolor{grabcolor}{RGB}{0,0,0}

\DeclareMathOperator*{\argmax}{argmax}
\DeclareMathOperator*{\argmin}{argmin}

\newenvironment{col}[1][1.0]{\begin{minipage}[t]{#1\textwidth}\vspace{0pt}}{\end{minipage}}
\renewcommand{\section}[1]{\colorbox{headingcolor}{\begin{minipage}{\textwidth}\vspace{0.3cm}\hspace{0.3cm}\textbf{\Large #1}\vspace{0.3cm}\end{minipage}}\vspace{0.5cm}}
\renewcommand{\labelitemi}{\small $\bullet$}
\newcommand{\figcap}[1]{\begin{center}\textbf{#1}\end{center}}
\newcommand{\fig}[2][1]{\includegraphics[width=#1\textwidth,keepaspectratio]{figs/#2}}
\newcommand{\grabber}[1]{\colorbox{grabcolor}{\begin{col}\vspace{0.5cm}\begin{center}\textbf{\color{white} \Large #1}\end{center}\vspace{0.2cm}\end{col}}}
%\renewcommand{\refname}{\colorbox{headingcolor}{\begin{minipage}{\textwidth}\vspace{0.3cm}\hspace{0.3cm}\textbf{\Large References}\vspace{0.3cm}\end{minipage}}\vspace{0.5cm}}

\makeatletter
%Got this fix from http://www.latex-community.org/forum/viewtopic.php?f=50&t=3497
%To remove the star from thebibliography.
\renewenvironment{thebibliography}[1]
     {%\section*{\refname}% <--- outcommented
      \@mkboth{\MakeUppercase\refname}{\MakeUppercase\refname}%
      \list{\@biblabel{\@arabic\c@enumiv}}%
           {\settowidth\labelwidth{\@biblabel{#1}}%
            \leftmargin\labelwidth
            \advance\leftmargin\labelsep
            \@openbib@code
            \usecounter{enumiv}%
            \let\p@enumiv\@empty
            \renewcommand\theenumiv{\@arabic\c@enumiv}}%
      \sloppy
      \clubpenalty4000
      \@clubpenalty \clubpenalty
      \widowpenalty4000%
      \sfcode`\.\@m}
     {\def\@noitemerr
       {\@latex@warning{Empty `thebibliography' environment}}%
      \endlist}
\makeatother

\begin{document}\begin{center}\begin{minipage}[c]{\textwidth}

\pagecolor{white}
\large

\input{poster0}

\end{minipage}\end{center}\end{document}
