J. Philip Newell leads a weekend retreat titled "A New Birthing of Christ for Today," featuring presentations, meditation, sharing and reflection about Celtic Christian spirituality, from 7 to 9 p.m., Friday, Dec. 4. $25 regular; $15 students. The event continues from 9 a.m. to noon, Saturday, Dec. 5. $30 regular; $20 students. A pass for both Friday and Saturday is available for $50 regular; or $30 students. Newell will also preach at services at 8 a.m. and 10 a.m., Sunday, Dec. 6, and lead an adult forum at 9 a.m. the same day. Free. Call 327-6857, or visit gsptucson.org for more information.