Power BI

I have a very simple table with two columns. Date, and Daily Events. The data comes a Big Data DB. The events are already aggregated per day but I want to run a cummulative total. The DAX CALCULATE function does not work since none of the two columns are expressions. I even separated the date into another table that has only Dates. So here is the way the data looks

Date                           NumberOfDailyEvents

2017-10-26                                      207294

2017-10-27                                      339522

2017-10-28                                      221002

        .                                                    .

        .                                                    .

I hope you get the picture. Now, I thought the calculate function should look something like this:

Can anybody please tell me what do I need to make this thing work (The NumberOfDailyEvents] is not a measure like I said, it comes directly from a DB.

thanks