Tom Blomfield - a Group Partner at Y Combinator is giving a talk about start-ups to Oxford students on Monday November the 25th at 17:30 in L1. 
Mathematrix, the postgraduate society for minorities in Mathematics, is running an event on Tuesday 12th November from 1-2 in L3. This will consist of three short 5 minute talks by postgraduate students about their research, followed by a Q&A about doing a Master's/PhD in Maths. There will be a chance to mingle with the postgrads afterwards over snacks.
Speakers include:
    
    
