What does spring rush actually look like?

i will be officially a student in january and im not sure if I should rush then or wait for next august. ive had mixed responses, some say spring rush is only open for Dphie and Alpha Phi even though a handful will claim to be involved (everything else requires invitation) and others say not to wait for 2025 bc sophomores are at a disadvantage. how would you get an invitation? do you have to know someone or do you reach out to the "participating" chapter? is the process similar to fall at all (ie. a itinerary for the week) in some aspects I appreciate the less intense rush method but is it really worth only having a couple options?