First you'll need a helium tank. You can get them from Party City, Target or Walmart. The 50 balloon tanks will fill about ten of the 17" balloons and the smaller 30 balloon tanks will fill about six 17" balloons.
You also need some 17 inch white latex balloons and the battery powered LED party lights to light the balloons. You can get those on Amazon.
17 Inch Latex Balloons White (Premium Helium Quality) Pkg/50
Vakind 60x White LED Party Lights Decoration light For Paper Lanterns Balloons
Finally, you'll need some thin white or gold ribbon, some post it notes and some narrow masking tape or painter's tape to modify the helium tank.
To make the balloons:
First we'll have to modify the helium tank slightly to work with the larger 17 inch balloons as the tank filler nozzle is designed to fill smaller balloons. So, with the tank valve closed, unscrew the helium filler nozzle and take some masking tape or painters tape and wrap it around the filler tube until it's about half again larger. That will make it fit the larger balloons. Then screw that filler valve back on.
Next we'll take one of the LED lights. You'll see there's a white tab on the side to keep the light from turning on. Go ahead and remove the tab and then turn the base of the light until it lights up. In our experience about 10% of the LED lights are bad so it's best to test them first before using them.
Then tie the tested LED light to a 2 to 3 foot section of ribbon, turn the LED light on and drop it into one of the 17 inch balloons.
It's also a good idea to cut several 6 inch sections of ribbon to tie the balloon closed. Because ribbon will be coming out of the balloon from the light, it's very hard to tie them in a regular knot. A second set of hands makes this step easier.
Next put the balloon over the filler valve, open the green tank valve and then press the filler tube up or down to fill the balloon with gas.
You'll want to make the balloon quite full so that it has enough helium to lift the two LED lights.
Then pop the balloon off and have somebody help you use a couple short sections of ribbon to tie the balloon closed.
You can then let the balloon float to the ceiling.
Then open and test another LED light and then tie it to the other end of the ribbon.
And, if you want, take a post it note and write a message that you can attach to the balloon. Fold the post it note in half over the ribbon and it will hold firmly .
Now your Memorial balloon is ready to launch.
Is not recommended to fill the balloons too far ahead of an event because the 17 inch balloons tend to be a little leaky . So I would launch them within about 10 minutes of creating them.
Release them into the dark and watch them disappear into the night sky. After a time, the lit balloons will be indistinguishable from the stars.