Add a new saint day, to the applicable subpage.
Portal:Saints/Anniversaries/January
Portal:Saints/Anniversaries/February
Portal:Saints/Anniversaries/March
Portal:Saints/Anniversaries/April
Portal:Saints/Anniversaries/May
Portal:Saints/Anniversaries/June
Portal:Saints/Anniversaries/July
Portal:Saints/Anniversaries/August
Portal:Saints/Anniversaries/September
Portal:Saints/Anniversaries/October
Portal:Saints/Anniversaries/November
Portal:Saints/Anniversaries/December
Feel free to add saint days to the above list.
Choose the next "saint day":