Happy new year! There is an open evening on Wednesday the 10th. You do not need to book anything, you ideally need to turn up at 7pm but later is also forgivable provided there are extra people to help with the late arrivals. An open evening is done every 2 weeks on Wednesday, so the next ones will be 24th January, 7th and 21st February, etc.
If for whatever reason you cannot make those dates or times, with some luck you can drop by the space at any day/time (evenings are best) and maybe one of our kind members can spend some time with you and show you around.