\documentclass{article}
\pagestyle{empty}
\usepackage{geometry,fontspec,tikz}
\geometry{a6paper,landscape,hmargin={1cm,1cm},vmargin={1cm,1cm}}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{ebgaramond}

\usetikzlibrary{fadings}
% \tikzfading[name=fade right, left color=transparent!0, right color=transparent!100]
% \tikzfading[name=fade in, inner color=transparent!200, outer color=transparent!0]

% \pgfdeclareradialshading{ellipse}{\pgfpoint{50bp}{50bp}}{
\pgfdeclareradialshading{ellipse}{\pgfpoint{100bp}{100bp}}{
  color(0bp)=(pgftransparent!100);
  color(25bp)=(pgftransparent!100);
  color(50bp)=(pgftransparent!80);
  color(75bp)=(pgftransparent!00);
  color(100bp)=(pgftransparent!0)}

\pgfdeclarehorizontalshading{FOne}{100bp} {
  color(0bp)=(pgftransparent!0);
  color(25bp)=(pgftransparent!0);
  color(50bp)=(pgftransparent!80);
  color(100bp)=(pgftransparent!100)}

\pgfdeclarefading{myfading}{\pgfuseshading{FOne}}

\setlength\parindent{0pt}

\begin{document}
\begin{tikzpicture}[overlay,remember picture]
  \node[anchor=east,inner sep=0pt] (pic) at (current page.east)
  % {\includegraphics[height=\pdfpageheight]{GAO_9361_01}};
  {\includegraphics[height=\pdfpageheight]{027-028}};
  % \fill[white,path fading=fade right] (pic.north west) rectangle (pic.south east);
  \fill[white,path fading=myfading] (pic.north west) rectangle (pic.south east);
  % \coordinate (pin) at (12,-2.5);
  % \filldraw[ultra thick,draw=red,fill=red!50] (pin) -- ++(70:.5) arc (-20:200:.18) -- cycle;
  % \path (pin) -- ++(0,.5) node[draw,fill,red,circle,inner sep=1pt] {};
  \node[anchor=south east, inner sep=0pt] (qr) at (pic.south east)
  {\includegraphics[height=2.8cm]{qr}};
\end{tikzpicture}%

\obeylines%
{\addfontfeatures{Scale=2.8,LetterSpace=9} INVITATION}

\bigbreak
\textit{%
  Dear friend,

  We'd love to invite you to our wedding reception.

  Sincerly,

  Nam and Huong
}

\vfill
{\addfontfeatures{Scale=1.4,LetterSpace=5}\scshape when?}
\textit{%
  March 1\/\rlap{,}\textsuperscript{st} 2020
  4\kern.5pt:\kern.5pt00 pm
}
\medbreak
{\addfontfeatures{Scale=1.4,LetterSpace=5}\scshape where?}
\textit{%
  Auco Convention Center,

  1A Nguyen Huu Cau Str, Ngoc Chau Ward

  Hai Duong City, Hai Duong
}

\end{document}