someone who did the house side probably knows better but from the ILA emails the procedure is:

show up before the hearings start
put your name on the list, get a number ticket.
There are two separate committees so you'll have to do this twice.
Wait for your number to come up and you get your 3 minutes to speak.

from the ILA email:
Details for testifying on Monday, March 4:
  • At 10:30, the Senate Judiciary Committee will hear the following bills in the Old Supreme Court Chamber (Room 220) of the state Capitol:

HB 1224 and SB 196
  • Also at 10:30, the Senate State, Veterans, and Military Affairs Committee will hear the following bills in Senate Committee Room 356 on the third floor of the state Capitol:

HB 1229, HB 1228, and HB 1226
  • Please make plans to arrive at the state Capitol in Denver no later than 9:45 a.m.


  • Once you arrive, please make your way to the respective committee rooms so you can sign up to testify in opposition to these measures. You will be assigned a number indicating the order you will be able to testify. This will allow all interested parties the opportunity to testify before both committees.


  • Please note, you will be limited to three minutes of testimony in each committee to address all of the bills.


and the address of the capitol is
200 E Colfax
Denver CO 80203

I have no idea how parking is downtown, do not expect it to be easy.

(something is wrong that I have that address memorized)