"The only stupid question is the one you don't ask."
Hey, we've all been there. Short answer is Yes.
Now, how to do it is a much bigger answer. If you have one of the Canon flash units with the included foot, that has the 1/4-20 threaded hole and can be mounted on a tripod or light stand. Lacking that, there are any number of other devices that would work.
For less than $50 US you can probably find a lightweight light stand and put an umbrella holder that has a cold shoe on it. Just a bracket similar to what is on top of your camera, but no electical contacts. About $20 US for that. Add an umbrella and you have a nice little lightweight light modifer setup that is easily transportable. Visit The Strobist
for some ideas along that line.
Here is an image of just such a device from The Strobist.
Good luck.
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