I am doing my first parkrun tomorrow and apart from being a bit apprehensive as I haven't actually run very much at all since finishing c25k a couple of months ago am a bit confused as to what to do with the barcode. Do I need to display it or just have it on me? If I put it in the little pocket in my running trousers won't it get all sweaty and run. Its forecast to be too warm for a jacket so I don't think that will be an option. Safety pin it to my top?? Any tips please