\documentclass[20pt,margin=1in,innermargin=-4.5in,blockverticalspace=-0.25in]{tikzposter}
\geometry{paperwidth=33.11in,paperheight=46.81in} %A0
% \geometry{paperheight=33.11in,paperwidth=23.4in} %A1
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{mathrsfs}
\usepackage{graphicx}
\usepackage{lipsum}
\usepackage[export]{adjustbox}
\usepackage{enumitem}
\usepackage[backend=biber,style=numeric]{biblatex}
\usepackage{ubtheme}
\makeatletter
\setlength{\TP@visibletextwidth}{31.0in}
\setlength{ \TP@visibletextheight}{45in}
\makeatother
\usepackage{mwe} % for placeholder images
\usepackage{bm}
\usepackage{bbm}
\definecolor{bristolred}{HTML}{B01C2E}
\addbibresource{refs.bib}
% set theme parameters
\tikzposterlatexaffectionproofoff
\usetheme{UBTheme}
\usecolorstyle{UBStyle}
\usepackage[scaled]{helvet}
\renewcommand\familydefault{\sfdefault}
\renewcommand{\vec}[1]{\bm{#1}}
\newcommand{\Tr}{\text{Tr}}
\usepackage[T1]{fontenc}
\title{\parbox{0.95\linewidth}{Title of your mathematical poster goes here}}
\author{\textbf{Author goes here}\textsuperscript{1}}
\institute{\textsuperscript{1}School of Mathematics, University of Bristol, UK}
\titlegraphic{\includegraphics[width=0.2\textwidth]{logo.png}}
% begin document
\begin{document}
\maketitle
\centering
\begin{columns}
\column{0.5}
\block{Section 1}{
\lipsum[30]
\begin{align*}
\includegraphics[width=0.1\textwidth,valign=c]{kitten.jpg}
\end{align*}
\lipsum[10]
\begin{align*}
x = \frac{-b \pm\sqrtsign{b^2 - 4ac}}{2a}.
\end{align*}
\lipsum[20]
}
\block{Section 2}{
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
}
\column{0.5}
\block{Section 3}{
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
\textcolor{bristolred}{\lipsum[100]}
\lipsum[100]
\lipsum[100]
\lipsum[100]
\lipsum[100]
}
\block{Conclusions}{
\lipsum[100]
\cite{dirac} \cite{knuthwebsite}
\lipsum[100]
\lipsum[100]
}
\block{References}{
\begin{center}
\mbox{}\vspace{-1\baselineskip}
\printbibliography[heading=none]
\end{center}
}
\end{columns}
\end{document}