I was assuming you meant by public transport; according to SPT, you can do Central to EK in 30 mins, though the hotel in question seems to be a bit remote even by EK standards (it might be nearer one of the stations just before EK, but the map I have isn't clear).
I'd have thought 30 mins from Woodlands to EK in the rush hour was a bit optimistic; I had to do it from Partick a few times, and it was nearer an hour, even avoiding the M8...
ROL have a track record of this kind of thing, though. I had planned to go to their Manchester show last year, but by the time I'd left work and crossed the Pennines, it would have been packing up. I realise that there are constraints both ways: the exhibitors have to go on somewhere else afterwards, and in the case of the "roadshows", this may well be to a stop somewhere on route to the next venue. In the end it's a compromise; the problem is that at present, it seems to be assuming that most RISC OS users are either students, unemployed or retired.
Also, hiring a venue in the centre of Glasgow, while desirable, is going to cost significantly more than doing the same in a hotel on the EK ring road. With only four companies shown as attending (plus NAUG), each exhibitor has to pay for travel, accommodation and 20-25% of the venue hire costs. I don't know how many users are likely to attend, but a city centre location may not even be viable once the costs are added up.