Let's start with the issue, where events held during the standard working day assume that people either:
- Are sufficiently their own boss, with suitable staff cover or time management, to decide "I'm going to this".
- Or, have management who realise the value of such events and are willing and able to arrange time out of work for them.
- Or, are willing and able to book their own holiday time to attend.
(Bear in mind that for many museum and gallery staff, their normal working week also includes weekends, and for some it includes regular evenings up to 10.00pm, but I'm talking broad strokes here)