When 2020 rolls around, and astronauts are stepping onto the Moon or Mars...
Sadly, no. Definitely not NASA, and I doubt even private industry or China / India will be there by then.
Could be off by five years but I think it’s doable. Depends on how fast the US recovers.
If NASA puts astronauts back on the moon by 2025 I will eat my hat. They have no credible plan or sufficient funding to do it. And funding for manned spaceflight is likely to be cut further due to competing budget priorities.
Or more likely, depends on how fast the US decides to care about it.
No radiation shielding?
No, a little is worse because secondary particles are worse than primary. The best thing to do when caught in a solar event beyond the van Allen belts is to hunker down behind a big thick shield; Heinlein covered this in Podkayne of Mars.