Because we want to know if you submit something or not. It doesn’t add points, or give you more chances to get selected, it’s an informative thing only.
Whatever you prefer, in the end, we will be able to see if you submit something, since it’s on github, and we share the lists. Again, if you submit a proposal, it won’t give more credits, or add points to your application for Space Volunteer. The only thing is that you will have to be conscious that Space Volunteers are requested to commit to stay at the Space a certain amount of time (that will depend on each space), so it’s not a sponsoring to attend the event.
Hope this clarify a little.
Regards,