I’ve always suspected that Stephen Hawking’s time traveler party did happen and there were many people there but Hawking’s agreed to tell everyone that no one showed up.
I bet they also made a clone of Hawkings and left the clone behind and took the real him to the Future with them.
He’s probably partying in 2743 right now in an 18 year old body, surrounded by beautiful futuristic space babes with neon hair and skintight glitter clothes.
If I can transport things back and forth, I would probably go and max out a credit card and buy all of the gold that I can to bring with me for trade.
Then I would go to the library of Alexandria and use my cell phone to get photocopies of as many books as I possibly can, and in the downtime I would go to any open Street markets and purchase any cool relics that I can find.
Then I could come back and share some of the Lost books of Alexandria with the world and also have period correct relics that have somehow magically not been exposed to a thousand years of environmental corrosion.
Then again, that would probably also mess up their radioisotope dating but I don’t know if it’s specific enough to only cover a thousand ish years.
Maybe if I have a little more time to prep I can find some place that I know hasn’t been Disturbed and like put them in an airtight safe and store them for me to go back and ReDiscover now.