Board Thread:Questions and Answers/@comment-26289812-20150510155140

During the 30 Million DL's event it only took 3 Gems to Rare Summon with a guaranteed minimum of 4* units. If I wait, will another 3-Gem-Summon event come around, or was that a one-time thing?

Also, are there regular events where units are guaranteed to be at least 4*?

Google hasn't done jack to answer these questions for me, so thanks for the help in advance! 