The Church of the Little Flower will hold a theological reflection, "The Eucharist, Our Advent Joy," from 7 to 7:30 a.m. today. 5607 Massachusetts Ave., Bethesda. 301-320-4538.
Saint Mark Presbyterian Church will hold a Celtic holiday celebration with dulcimer performer Maggie Sansone, vocalist Lisa Moscatiello, fiddle player Rosie Shipley, Irish flutist and pennywhistle player Laura Byrne and cellist Fred Lieder at 7 p.m. Saturday. 10701 Old Georgetown Rd., Rockville. $18 in advance; $20 at the door. 301-530-1735, Ext. 5 or www.saintmarkpresby.org.
St. John's Lutheran Church will hold the installation of the Rev. Scott Gustafson at 11 a.m. Sunday. Free potluck lunch to follow. 4629 Aspen Hill Rd., Rockville. 301-946-5458.
B'nai Israel Congregation will hold a "sisterhood holiday boutique" from 9 a.m. to 3 p.m. Sunday. Free. 6301 Montrose Rd., Rockville. 301-933-6696.
The Board of Jewish Education will present "Gems of the Prayerbook," a series of four lectures starting at 12:30 p.m. Monday and continuing through Dec. 26. Ring House Auditorium, 1801 E. Jefferson St., Rockville. 301-816-5009.
The Shalem Institute for Spiritual Transformation will hold a five-day retreat called Awakening Hope Dec. 5-9. The retreat will be at Bon Secours Spiritual Center in Marriottsville. $625; includes tuition, room and board. 301-897-7334 or www.shalem.org.
Grace Episcopal Church will hold a lunchtime music and reading with soprano Julie Lees and reader Anne Sheldon at 12:30 p.m. Wednesday. 1607 Grace Church Rd., Silver Spring. 301-587-8046.
-- Compiled by ARUNA JAIN