Can I limit how many entries a person can register?
Settings > Registration > Registration limit and Settings > Categories
In Settings > Registration > Registration limit, you can choose between allowing "Multiple entries per registration" and "One entry per registration".
If you choose to allow "Multiple entries per registration" you also get the option to set an "Entry limit per registration".
In addition to this, when creating your program categories in Settings > Categories you can set "Entry limit for the category per registration" for each category.