How quickly do you need to set up / tear down?

A couple of these: CHAUVET DJ CH06 Lightweight Lighting Stand w/T-Bar (50lb Capacity) https://www.amazon.com/dp/B0096JYRY6/

...would give you a mounting location above eye level. Now you can decide your light budget. At the cheapest would be 4-6 basic hardware clamp lights (like these, but get them at a local hardware store for about $6): Simple Deluxe 2-Pack Clamp Lamp Light with 8.5 Inch Aluminum Reflector up to 150 Watt E26/E27 Socket (no Bulb Included) 6 Feet 18/2 SPT-2 Cord UL Listed https://www.amazon.com/dp/B06XD1PK37/

Point them up at the ceiling for good ambient light, or aim one or two at the performance area. Higher in budget, a couple of inexpensive LED par lights may be enough to light the practice space. You probably won't need sandbags for that small amount of weight.

Brighter, but a bit more expensive: you could even suspend /attach shop lights to the light tree cross bars. I recommend LED in case they fall.

Sunco Lighting 2 Pack LED Utility Shop Light, 4 FT, Linkable Integrated Fixture, 40W=260W, 5000K Daylight, 4100 LM, Frosted Lens, Surface/Suspension Mount, Pull Chain, Garage - ETL, Energy Star https://www.amazon.com/dp/B0725D24X2/

The trees will make setup and teardown easier, you can run power right up them, and if you move spaces they're useful in the future. Those string lights are not very bright and you'll begin losing bulbs as soon as they get jostled while hot (if incandescent). Plus taking tape on and off each time may be a big pain.