Feast day
The memory of St Gelase is celebrated every year on December 31. Last feast was on a Tuesday. Next feast in 2025 will be a Wednesday on 11 months 3 weeks.
Fast
fasting day with fish, wine and oil permitted (ichthyos)
The St Gelase Day is not a fasting day per se, but in 2024 the date of December 31 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.