There are 17 words that start with 'event'.
| event | events | 
| eventful | eventide | 
| eventual | eventides | 
| eventless | eventuate | 
| eventfully | eventually | 
| eventuated | eventuates | 
| eventuality | eventuating | 
| eventfulness | eventualities | 
| eventfulnesses | |
Note: These 17 words that start with 'event' are found from the USA & Canada version of the tournament Scrabble word list.