There are some calendars for upcoming launches, like the Reddit one.
Is there some corresponding calendar for arrivals and other planned events of all ongoing deep space missions? So that events like Juno arrival into Jupiter orbit in 35 days don't come as a surprise to me.
(since links these resources go outdated after a while, it would be nice to paste the current schedule for as far as it reaches... probably a good 15 years since today would be covered that way.)