LEAD: It had all the hallmarks of a typical American convention: goofy hats, giggling participants, snapping cameras and lots of name tags.

He expects to see people wearing goofy hats with leaning towers on them.

Just look at those fans, with their goofy hats, loud Bermuda shorts and T-shirts stained with mustard.

Mrs. Lowenfels, whose trademark is a goofy woolen hat, was one of about a dozen souls sweeping the park with metal detectors that day.

Spoofing period fashion is an easy laugh, but one Mr. Berger insists on milking thoroughly with a succession of outlandish costumes and goofy hats.

That whole image of the goofy middle-aged guys chomping cigars and wearing goofy hats is really rooted in there.

I don't know what she was doing, but she was onstage and wearing a goofy hat and all the other mothers were cracking up.

As for the Persians, no tired robes and goofy hats here.

Others say that the sheer frisson of donning badges and goofy hats en masse should not be mistaken for an occasion of civic moment.