After listening to more of the tributes, I discovered that Glen did an annual Christmas busk for a Dublin homeless charity. It all started in 2010 when he was asked to join the charity choir as he walked past while doing his Christmas shopping. He didn't make it back that day, but did return the following day to busk and donate any proceeds to the charity. By chance, he was joined by Irish singer Mundy (see previous page for one of his songs). I couldn't find the story on Youtube, but Glen tells it himself on Facebook. Over the last 15 years he persuaded such big names as Bono, Imelda May, Hozier and Sinead O'Connor to join him. The busks have raised over €2 million ($2.31 million) for the charity. Here are some clips from 2015:
The day after Glen's death, a group of buskers/musicians organized a tribute busk at the statue of another great Irish musician, Luke Kelly. One of them was apparently playing a guitar which Glen gave him because he didn't have one.