You can definitely join the challenge. I am sure you can put together a concept pretty quickly.

I ran a 6 DAY challenge in January and had a few people participate. only a few participants, but they wrote: 1x Feature script, 1x 35 page short, 1x 5 page short, and I wrote a 88 page feature in the first 52 hours... With NO concept in mind prior to that start of the challenge. Just wrote based on some random keywords generated on the internet on a livestream at the start of the challenge. If I can do that...I bet you can knock out a feature script in 6 weeks.