Is it in a location you need to go anyways and can cover your travel expenses to get there?
2. Topical & strategic aligment
How aligned are the topics and audience of the event with our current focus? Will you be able to learn something new on subjects that are in the current focus?
Will you be able to meet people that are strategic for your current projects?
3. Stategic relationships
Is it strategic to build a good relationship with the organization running the event, because we want to partner in the future or want to support the mission?
Are we currently actively trying to promote something this will give us an opportunity for? How big will the audience be /are talks being filmed or streamed?
How complicated will it be to get there (how much of your energy will it take)? If it's a far trip, can you connect it with other things? Is the opportunity worth the enviromental footprint?