On Saturday night, we attended a program of Gilbert and Sullivan gems at Georgetown University. The admission price and the caliber of the performance were a pleasant surprise.

First we were treated to songs from a dozen G&S operettas as performed by The Music Lobby (Jack Marshall, Paul Klingenberg and Tom Fuller were outstanding). Then the Georgetown Gilbert & Sullivan Society presented "Trial By Jury" with such verve that we went home with the firm opinion that the $2 admission price had been one of the best bargains of the year.

Klingenberg is a third year law student. After he obtains his law degree, he hopes to pursue twin careers - as a lawyer and an opera singer. If he changes his mind, I think he'd be a success as an actor. He has a delightful touch with comedy.

After the show, one of the wives in our party decided that we needed refreshment and another suggested it would be fun to go to one of the off-campus places frequented by undergraduates.

So we walked down O Street, turned right, and ended up at The Tombs.

The noise level there was high enough to give a headache to a marble statue.

A juke box and a television program were going full blast simultaneously. Patrons tried to talk loud enough to be heard over the din, but I can assure you that during the hour we were there I didn't understand anything that was said to me.

As we walked back to the campus to get our cars we encountered scores of undergraduates whooping it up in Halloween costumes, and that touched off a debate about the date of Halloween. I insisted that Oct. 31 is the traditional date, and that Lyndon B. Johnson had made it official by issuing a presidential proclamation to that effect. But the wives were unanimous in telling me I was wrong; they said Halloween is always observed during the weekend before Oct. 31, regardless of official decrees. Halloween is celebrated on a Friday or Saturday night so that little children can stay up later than they can on school nights.

If the wives were right (and who ever heard of a wife being wrong?), it is already too late for me to remind you to have a dish of small change ready for the hobgoblins in your neighborhood. Each year, American children collect millions of dollars for UNICEF, the United Nations children's fund that benefits the neediest children in more than 100 countries. If you were away from home on Saturday night as I was, perhaps the children in your neighborhood have already made their collection tours and you will think you have missed your chance to participate. But don't despair. All is not lost.

If nobody comes around to Trick or Treat for UNICEF tonight, you can mail in your pennies and nickels and dimes, but I don't recommend that. It would probably cost 30 cents to mail 15 pennies.

It would be a better idea to write a check payable to UNICEF and send it - at the cost of only one stamp - to UNICEF Information Service, 110 Maryland Ave. NE, Washington, D.C. 20002.

UNICEF gets a lot of mileage out of its money. For a penny, it can buy a sterile gauze pad to cover a child's wound. A dollar provides enough vaccine to immunize 11 children against polio. Five dollars can help an entire village.

And I'd like to assure you that if your check is for more than $5, the United States Postal Service will still deliver it for the same 15 cent fee. So you might as well send $10 or $25 and get your 15 cents worth. Thank you.