"Canadian Drama: Present and Future" will be the Feb. 14 theme for the current symposium on 20th-Century Canadian Culture, sponsored by the National Endowment for the Humanities. With Toronto Globe and Mail drama critic John Fraser as moderator, the panel, meeting at 8 p.m. in the Phillips Collection, will include Jean-Claude Germain, director of Montreal's Le Theatre d'Aujourd'hui; Tom Hendry of the Toronto Free Theater: John Hirsch, TV drama head of Canadian Broadcasting Corp., and Jean Louis Roux, artistic director of Montreal's Le Theater du Nouveau Monde.

"A Texas Trilogy" is far f rom dead. London soon will see "The Last Meeting of the Knights of the White Magnolia" and director Michael Rudlin reports that similar organizations are also a part of English life . . . Another London line: "Side by Side by Sondheim," a brilliant collection of songs of Stephen S. so far heard only on discs in this country, will have a Broadway run with its performing instigators, Millicent Martin, Julia McKenzie and Ned Sherrin by a special arrangement with American Equity. Don't look for it in Washington.

The recent death in Paris of Maurice Goudeket, widower of Colette, may free the stage adaptations by Anita Loos for revivals of "Cheri" and "Gigi." Because Colette's surviving daughter did not want Goudeket to share any of the royalties, left to them jointly, she refused permission for revivals.

"Only a few weeks ago," chuckles Loos, "Ina Claire was urging me to find her a play." Both have roles for the star who retired years ago to San Francisco.

From Switzerland to Lisner auditorium on Saturday night at 8 comes the brilliant mime-mask troup, "Mummenschanz" . . . From India will come dancer Yamini Krishnamurti, the exponent of Bharatanatyam, who will perform on Feb. 19 at 8 o'clock in the World Bank auditorium for an invited audience.

It's Lillian Hellman time. Besides "The Autumn Garden," which opened last night at Arena Stage, two other Hellmans are current in the area. Silver Spring Stage is continuing "The Little Foxes" for the next two Fridays, Saturdays and Sundays at 10145 Colesville Rd., in the Woodmoor Shopping Center: tickets at 593-9855. On Tuesday Baltimore's Center Stage revives "Toys in the Attic" under the direction of Stan Wojewodski Jr. The run will be through March 6, with Beeson Carroll, Tommy Hicks, Ruby Holbrook, Walter Jones and Deborah Offner in the cast. Ticket information: 301 - 332-0033.

Stubby Kaye, the first to sing "Sit Down, You're Rockin' the Boat," stars in the Hayloft Dinner Theater's next, a new comedy, "Mind With the Dirty Man," about a Baltimore suburbanite whose son, to his horror, turns out to be a porno king.This opens Tuesday . . . Saying goodbye is Harlequin Dinner Theater's "The Boys From Syracuse," to make way for "Once Upon a Mattress," the musical that put Carol Burnett's name above the title. This opens Feb. 10 . . . Shady Grove has picked its season's opener. Gladys Knight and the Pips, who begin a six-night run May 3, to be followed by Sonny and Cher . . . "Mine Tripping," part of the Archaesus repertory, will be played Sunday at 2:30 in Catholic University's Caldwell Hall; details at 362-7032 . . . Kathleen B. Fuller will begin a 10-week acting workshop for adults Tuesday at 7:30 under sponsorship of Arlington Theater Associates at Stewart Arts Center, 2400 N. Underwood St., Arlington. Details at 558-2161.