Here are several details on scooter rentals, specially arranged transport, etc.

Tom’s Wheelchairs
210-223-7878
Rental is $50 a day (from one day to the next), $200 for the length of the conference. No deposit needed beyond a credit card number to reserve the scooter with 24-hour advance notice. 

Uber has an accessibility program:
https://www.uber.com/us/en/about/accessibility/#:~:text=Riders%20with%20disabilities,-Uber%27s%20technology%20is%20helping 
 
The San Antonio bus system is called the Via Metropolitan Transit system. You may apply with them in advance to receive services: 
https://www.viainfo.net/how-to-ride/#accessibility2ed8c-5924
  
Alamo Wheelchair Transportation services:
Edgar owner, driver
210-907-0055
Book online with at least a 24-hour notice: https://www.alamowheelchairtransportation.com/
Rates are $40 minimum up to 10 miles (all the evening public events are under 10 miles), $4.00 for each additional mile. (He can accommodate a scooter).
 
Max Care Service (mention conference for a discount)
210-557-6813
https://Maxcareservice.biz 
Request at [email protected]
Rates:
$50.00 pickup fee for wheelchair service
$3.00 for each mile
$35.00 pickup fee for non wheelchair service
$2.50 for each mile
They need a 2–3-day advance notice.
 
Mary Helen, Independent driver
210-861-1884
$20 flat rate one way for up to 4 passengers
non wheelchair service