DIY music stage

Hey ya’ll,

Having a wedding in 4 weeks and need to build a stage (basically just a level and stable platform) on slightly sloped grass. It needs to be 20x15 ft and hold 10 people and quite a bit of musical gear.

Unfortunately, it’ll only be used once and sold or disassembled, and budget is tight. Any idea or plan sheets for how to DIY this? Anyone done something similar here?