As AG said, the Modern Pro Tour will cause things to spike prior to the event itself because of all the speculation about what is going to be banned/unbanned. A lot of those spec gains (E.g.
SFM,
SotM) are already built in since that speculation began in earnest last month and we're really close to PT Oath. A few other notable dates would be the weekends of March 4th (3 Modern GPs), May 20th (2 Modern GPs), and August 26th (3 Modern GPs). All of those will bump whatever does well. Remember, you want to buy in with a healthy bit of lead time before they start spinning up Modern interest and you're better off being patient than rushing into whatever spiked the latest event.
As for Blood Moon I'd probably hold off until the Ban announcement has been made as that probably has the highest likelihood of a ban outside of Bloom.