Imperial College academic here. I haven't seen any fliers or posters around college today so this might have something to do with your lack of uptake. This is in contrast to the event you had earlier in the year which was prominently advertised around the place.

Also I noticed there is a careers fair happening today, predominantly big engineering firms/consultancies/banking, and I didn't see if you had any representation there (apologies if you do and I missed it).