based on past experience i think you are allowed to carry season tickets into the next season. Only the purchase and spending of tickets are limited to the last month of the season.

Also, regarding the discussion of the rate of reward drops and their value in this thread: I complied a table yesterday based on draws from accounts i have access to, if anyone's interested :^)

(Shira frag prices are based on current Guren event prices taken from the NO Community Discord. Other prices are taken from the shop in game. Prices are weighted by their % chance to give the average value per ticket.)