Add event_start field like event_end

[studiokaloa]

It would be interesting to add a start date field "event_start" of the event like the end date field "event_end".
Using the "datetime" field, it is not possible to dissociate the date of the news from the date of the event while the date of a news is not necessarily the date on which the event takes place.

It is possible to create a news item dated in October for an event that takes place in November.

Best regards