Allow attendee to choose which days to attend in ticketing

We can currently limit tickets to specific days. However, it would be useful if we can allow the attendee to select which days they wish to attend. We have a 6 day event and would like to allow the attendee to select for example to attend days 1 and 4 if that made sense to them. In the same way that ticket pricing can be set to allow access to x number of talks, perhaps we can have an option for x number of days for which the attendee then chooses their preferred days of attendance? Thanks.