Apart from a Friday when they are playing a little outside of Los Gigantes, (a taxi will only cost around ?3 to take you there), you can easily walk to see them on any Thursday or Saturday. If you mean which night are they playing in the Plaza (Day of the Tourist) I have not seen the exact date advertised yet, so if a LG resident does not know the date, I will ask when I see them next (probably next week) and I will try and post here. The write their own songs as well, usually if someone says 'We will play something we wrote ourselves' it is a sure sign to yawn, but their music is also very good, even on first time hearing. They have a website and you can get a regular newsletter just by leaving your email address.http://www.travellertenerife.com/
They have a couple of tunes on the site so you can get a taster. Enjoy !!!