Immaculate Conception is celebrated on Dec. 8th or 9th this year because Sunday is the 8th. I think my parish is celebrating it on the 8th.
Our Lady of Guadalupe is Dec. 12th. My parish is 80% Spanish and this feast is huge. The Bishop is coming to celebrate Mass. Are you familiar with the story of Our Lady of Guadalupe? It is amazing. If you have access to EWTN and they feature the documentary, watch it; if not, look it up.