critical mass DISASTER!

an old "grand sport" i picked, stripped down, media blasted and painted, and then turned into a fixed gear via brazing the shimano freewheel i had and a british single speed kit. the only problem was that i didn't buy a larger front chainwheel. i then rode it in a critical mass...... the chainwheel sent my legs spinning, and also the cottered cranks began to come loose..... i quit shorlty after mile 10... "happy friday"