read -rd "" cal_events <<'EOF'
3,17,Saint Patrick's day,Happy,🍀
10,31,Halloween,Have a spooky,🎃
12,25,Christmas,Merry,🌲
*,Friday,Friday,Happy,🚀
EOF

if [[ -f ${XDG_CONFIG-"$HOME"/.config}/events.csv ]]; then
  cal_events=$(< "${XDG_CONFIG-"$HOME"/.config}"/events.csv)
fi

read -r cur_{month,day} dow < <(date "+%m %d %A")

while IFS=, read -r ev_month ev_day ev celebrate sym; do
  if [[ $ev_month = '*' ]] || (( 10#$cur_month == 10#$ev_month )); then
    if [[ $ev_day = '*' || ${ev_day,,} = ${dow,,} ]]; then
      printf -v ev_banner '%s %s!\n' "$celebrate" "${ev^}"
    elif [[ $ev_day =~ ^[0-9]+$ ]] && (( 10#$cur_day == 10#$ev_day )); then
      printf -v ev_banner '%s %s!\n' "$celebrate" "${ev^}"
    elif [[ $ev_day =~ ^[0-9]+$ ]] && (( 10#$cur_day < 10#$ev_day )); then
      printf -v ev_banner 'Only %d days until %s!\n' "$(( 10#$ev_day - 10#$cur_day ))" "${ev^}"
    fi

    if [[ -v ev_banner ]]; then
      printf %s "$ev_banner"
      prompt_symbol=$sym
    fi
  fi
done <<< "$cal_events"