Back of the envelope:  

100 events * 500 people * $1500 a head is $75,000,000 dollars if there are 500 people paying $1500 on average over 100 events.   That's $15 million spread over 100 events for every 100 people paying $1500.  The VICE article states that there are also many events that charge less and for meeting other Liberal politicians.

Link to VICE article:
vice.com/en_ca/article/the-trudeau-government-scheduled-more-than-100-cash-for-access-events-in-2016-alone