G20 Osaka Summit will be held this weekend as you know.
Large-scale traffic regulations will be enforced from 27th to 30th,June.
It’s better for you to use public transportation, not automobile for moving.
Either taxi or bus are not recommended.
Osaka Metro, JR, the other railways,bike or walking is better.
Please refer to the site of Osaka pref police like below about details.
Feel free to ask your host at any time if you have any questions and problems.