I don’t believe there would be any H5P Events in Moodle 3.7, even when using the H5P plugin, as the events actually need to be in the Moodle core code I think?
I may be wrong (I’m not a developer) and it may be that events can be added with plugins, but I don’t think so?
The H5P in core from 3.8, and even more so in upcoming 3.9, should allow for H5P events though just as with other activities.