\documentclass[a0paper,twocolumn]{a0poster}
\pagestyle{empty}
\setcounter{secnumdepth}{0}
\usepackage{pgf,tikz}
\usetikzlibrary{calc,through,intersections}
\usetikzlibrary{patterns}
\usetikzlibrary{scopes}
\usetikzlibrary{arrows}
\usetikzlibrary{matrix}
\usetikzlibrary{calc,through}
\usetikzlibrary{shapes,snakes}
\usepackage{graphics, times}
\usepackage{eso-pic}
\usepackage[absolute]{textpos}
\usepackage{amsmath,amssymb}
\definecolor{sab}{rgb}{0.6,1.0,0.6}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{color}
\definecolor{DarkBlue}{rgb}{0.1,0.1,0.5}
\let\Textsize\normalsize
\def\Head#1{\noindent\hbox to \hsize{\hfil{\LARGE\color{DarkBlue} #1}}\bigskip}
\def\LHead#1{\noindent{\LARGE\color{DarkBlue} #1}\bigskip}
\def\Subhead#1{\noindent{\large\color{DarkBlue} #1}\bigskip}
\def\Title#1{\noindent{\VeryHuge\color{red} #1}}
\def\TiTle#1{\noindent{\VeryHuge\color{green} #1}}
\TPGrid[40mm,40mm]{23}{12}
\parindent=0pt
\parskip=0.5\baselineskip
\usepackage[colorlinks]{hyperref}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[Kashida]{xepersian}
\settextfont{Persian Modern}
\defpersianfont\adobe[Scale=1]{Tahoma}
\defpersianfont\Entezar[Scale=1.8]{Yas}
\defpersianfont\Entezarp[Scale=1.8]{Yas}
\defpersianfont\Erp[Scale=2.5]{Persian Modern}
\defpersianfont\eer[Scale=1.5]{Persian Modern}
\defpersianfont\eerr[Scale=1.2]{Persian Modern}
\deflatinfont\lat[Scale=1.52]{Times New Roman}
\defpersianfont\titp[Scale=3]{XB Kayhan Navaar}
\setsayehfont[Scale=1.3]{XB Kayhan Navaar}
\setiranicfont [Scale=1.4]{XB Zar Oblique}
\newcommand{\xe}{\lr{\fboxsep 2pt \scalebox{5}{\textcolor{green}{\sayehfamily \XePersian}}}}
\newcommand{\xefa}{\fboxsep 2pt \scalebox{2}{\textcolor{black}{\sayehfamily زیپرشین }}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%رنگ پس زمینه
\definecolor{lightblue}{rgb}{0.68,0.93,0.93}
\pagecolor{lightblue}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{textblock}{45}(.250,0)
\tikzstyle{mybox} = [draw=blue, fill=green!20, very thick,
rectangle, rounded corners, inner xsep=20pt, inner ysep=20pt]
\tikzstyle{fancytitle} =[line width=1mm,draw=red,fill=red!20, text=black, ellipse]
\begin{tikzpicture}[transform shape, baseline=-3.5cm]%rotate=10
\setRTL
\node [mybox] (box) {%
\begin{minipage}[t!]{0.5\textwidth}
\LARGE
\vspace*{7cm}
\begin{center}
{\Erp
\ \ \ \ زمان : چهارم تا هفتم شهریور
}
\end{center}
\vspace*{2cm}
\begin{center}
{\eer
دانشجویان و اساتید علاقمند میتوانند جهت ثبت نام به ...
\lr{\lat ia.aaaaaa.ac.ir}
که در دانشگاه
\\ \vspace*{2cm}
برگزار میگردد مراجعه نمایند
}\\
\vspace*{2cm}\eerr
خاطر نشان میشود که به کلیه شرکتکنندگان در کارگاه، گواهی حضور با آرم .... اعطا میگردد.
\end{center}
\end{minipage}
};
\node[fancytitle] at (box.north) {\hboxR{\LARGE
{\titp
کارگاه آموزش زیپرشین }
}};
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{tikzpicture}
\end{textblock}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\tikzstyle{fancytitle} =[line width=1mm,draw=red,fill=red!20, text=black, ellipse]
\begin{tikzpicture}[transform shape, baseline=-3.5cm]%rotate=10
\setRTL
\node [mybox] (box) {%
\begin{minipage}[t!]{0.5\textwidth}\LARGE\eerr
تذکر۱: .
\vspace*{2cm}\\
تذکر ۲:
\end{minipage}
};
\end{tikzpicture}
\end{textblock}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
خروجی: