Mothering Day, or Rose Sunday is coming up in late lent. Have a pastry!
Recite the Te Deum at sunrise on May Day.
I don’t know how unique these were to the Saxons, but St. George’s Day was the national saints day, then as now.
Many ancient practices of English Catholics would have been local, like throwing a farthing in the holy well of St. Margaret’s Church (the Treacle Well in Through the Looking Glass). Unless you live in Old Blighty, it will be hard to recreate these, but that was the stamp of pre-reformation Europe. We lost an awful lot, and the amount of loss helps explain why people fought so long and hard during the 1550 through 1600s.
But your English forbears would have prayed their Aves and Pater Nosters in Latin, on beads, and they would have kept a vigourous Lent, the Ember Days (itself a Saxon word), and Rogation Sunday.
You probably know about the Sarum missal, which was how they heard mass.
At this remove, and with the modern insistance that religion is fundamentally “personal,” it is hard to appreciate fully that our Catholic ancestors looked at the Faith as that which unified them with other all other men, not that which distinguished them.