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

if [[ -f ~/.events.csv ]]; then
  cal_events=$(< ~/.events.csv)
fi

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

while IFS=, read -r ev_month ev_day ev celebrate sym; do
  if (( 10#$cur_month == 10#$ev_month )); then
    if (( 10#$cur_day < 10#$ev_day )); then
      printf "Only %d days until %s!\n" "$(( 10#$ev_day - 10#$cur_day ))" "${ev^}"
    elif (( 10#$cur_day == 10#$ev_day )); then
      printf "%s %s!\n" "$celebrate" "${ev^}"
    fi

    PS1_prompt_sym=$sym
  fi
done <<< "$cal_events"