I live in Füssen and his Feast day is celebrated today 5th October,I can assure you! Taken from the Augsburg Liturgical calender, see below,

Mittwoch
05.10.2016
Franz Xaver Seelos, Priester
(nur in der Stadt Füssen)
Nicht gebotener Gedenktag

ST MANG BASILICA FÜSSEN GERMANY/BASILIKA ST MANG FÜSSEN DEUTSCHLAND
5 OCTOBER 2016/5 OKTOBER 2016
1830hrs Mass in the choir for Feast of Blessed Francis Xavier Seelos/Heilige Messe in Chorgestühl Gedenktag Sel. Franz Xaver Seelos
More info from seelosinfuessen.eucharisticrenewal.org/ and seelos.org

Brilliant.Interesting to know the history about why everyone is carrying a brick.150 years ago when the church of St Mary Assumptionwas being built by German immigrants in New Orleans,the wagons carrying the bricks couldn't get near the church due to the mud.The women of the Parish went out to meet the wagons and carried the bricks in their aprons to the church so it could be built.Now 150 years later they are re-inacting this historic event.This is also the Church where Blessed Francis Xavier Seelos was serving when he died.Blessed Seelos was born here.

Brilliant.Interesting to know the history about why everyone is carrying a brick.150 years ago when the church of St Mary Assumptionwas being built by German immigrants in New Orleans,the wagons carrying the bricks couldn't get near the church due to the mud.The women of the Parish went out to meet the wagons and carried the bricks in their aprons to the church so it could be built.Now 150 years later they are re-inacting this historic event.This is also the Church where Blessed Francis Xavier Seelos was serving when he died.Blessed Seelos was born here.