Christmas Lights and Hot Glue
For those (like us) who want/need to string Christmas lights horizontally on brick, stucco, concrete, or stone, try a hot glue gun. Just apply the glue to the plastic light socket and hold it in place for about 10 seconds until it bonds (warmer weather might take longer).
Word of caution: hot glue can damage newer stucco. Also, according to some people, a bit of glue residue may be left on the house when you take your lights down at the end of the season. But apparently, weather and sun eventually wears away the leftovers.
This guy will even show you how to do it…