Yep, for the two first european meets empeg the company provided T-shirts.
The first one (before I had discovered the empeg, sob...) had a car with Tux on the back and the text "Penguins love ICE" (if I remember Rob Schofields correctly), don't recall the front - probably logo... The second one had the empeg logo at the front (breast pocket position) and the logo above a wavy EU flag with the text "second european owners meet, 27 May 2001 Amersfoort, NL" below. Also a RioCar logo low at the back.

This years T's were made by Thomas (speedy67) with the empeg logo at front breast pocket position. At the rear a light blue block with a large "2002" (with the 0's as a circle of stars - EU flag style) in yellow and with "european empeg owners meet" in white. Below the block is "Amersfoort, NL 15th June 2002" in same light blue.

I'll see if I can get snaps of the last two and post tomorrow.

Edit: Come to think of it, they should be spottable in the pictures from the meets...