Catholics Could Have New Pope by Palm Sunday ROME - The conclave to elect a new pope might begin sooner than expected, the Vatican said today, meaning Roman Catholics could have a new pontiff well before Easter. "This time and situation is a bit different from last time," Father Federico Lombardi said. Church rules say a conclave must begin 15 to 20 days after the seat becomes vacant after a period of mourning. PHOTOS: Pope Benedict XVI Meets World Leaders This time there's no need to mourn; because the vacancy is not because of the pope's death, but because Benedict is resigning as of Feb. 28, the cardinals may have room to accelerate the schedule. RELATED: Pope Benedict XVI: Retirement Activities Could Include Writing, Visiting Brother Speeding up the process could potentially give the Church a new pope in time for Holy Week, the most important days of the church calendar. RELATED: Pope Benedict XVI Resignation: 7 Expert Picks for the Next Pontiff He could be formally installed at the Vatican in time to celebrate Palm Sunday, March 24; Good Friday, March 29; and Easter, March 31. Cardinals would also be able to return to their archdiocese to celebrate Holy Week with their communities. RELATED: 4 Major Challenges a New Pope Will Face