Dibs are currently set for 3 the first night. The next day you'll get more (6?)...it's based on an automatic algorithm, but I did ask Dave today about it because I wasn't the number to significantly increase the second night to, say, 8-10 requests and it turns out I should have the ability to increase it manually if needed.
My recommendation for tonight is to have your favorite 3 picked out and have your fingers on the 'trigger' button right at the start.