If you're coming into downtown Salt Lake City tonight, be prepared for big crowds. Look at what's going on tonight:

• The lights at Temple Square (bordered by North Temple, West Temple, South Temple and State streets) will be turned on at dusk - and the performance of "Savior of the World" starts at the Conference Center Theatre (on the corner of North Temple and West Temple) at 7:30.
• The "Light Up the Night Concert," featuring Jon Schmidt and the lighting of the tree at Olympic Legacy Plaza, is at 7 at The Gateway, South Temple and 400 West.
• And the Utah Jazz play the Sacramento Kings at 7 at EnergySolutions Arena, 301 W. South Temple.

Might I suggest taking Trax into the city?

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Here's some more holiday fun this weekend:

- "Plaid Tidings," the "Forever Plaid" Christmas musical, opens tonight at 7:30 at the SCERA Theatre, 745 S. State St., Orem. Shows run every night (except Wednesdays and Sundays) through Dec. 23. Tickets are $12, or $10 for children, students and seniors, at the SCERA web site.

- Hogle Zoo unveils "Zoo Lights," its annual holiday light exhibit, starting Saturday at 5 p.m. at the zoo, 2600 Sunnyside Ave., Salt Lake City. It runs every night until Dec. 31 (except Christmas Eve and Christmas), 5-8 p.m. most nights, open 'til 9 on Fridays and Saturdays. Admission is $6, $4 for children and seniors (a dollar off for zoo members), and free for kids 2 and under, at the gate.

- The Utah Symphony and Utah Symphony Chorus perform "The Sing-It-Yourself 'Messiah,' "
Saturday and Sunday at 7 p.m. at Abravanel Hall, 123 W. South Temple, Salt Lake City. Tickets, from $7 to $14, available at ArtTix.

- The 2nd Generation Osmond Family Christmas - made up of the sons of Alan Osmond, one of the original Osmond brothers - is set for Saturday at 7:30 p.m. at the Capitol Theatre, 50 W. 200 South, Salt Lake City. Half of the proceeds will go to The M.O.R.E. Project, a charity dedicated to impoverished families in Brazil. Tickets, from $17 to $29.50, at ArtTix.