Feast day
The memory of St Nisios is celebrated every year on February 27. Last feast was on a Tuesday. Next feast in 2025 will be a Thursday on 1 month 1 week.
Fast
fasting day with milk, cheese, eggs and fish permitted (tyrini)
The St Nisios Day is not a fasting day per se, but in 2024 the date of February 27 falls within a fasting period.
Take a look at the ephemeris of the day to see other saints and given names celebrated on the same day.