Go as something fun instead of scary. I'd do something for my mom, think 1980s.
80s Prom? 80s Flashdance? 80s Aerobics? 80s Cassette Tape? 80s Rock? Can be Madonna, Guns n Roses, Glamrock with the Makeup, etc.
This Cassette Tape looks pretty cosmic colored to me. You can get a funky hat or shoes, headphones, do some make-up, etc. It's a lot of possibilities.