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It surely isn't a permanent event in terms of being available 7 days a week. I've noticed it stays up for like 3 days at a time. Also, it's now about pumpkins because of Halloween but before that it looked differently. However, the principle was the same - choose 1 out of 5 possibilities, and it would remain active for 2-3 days.
This said, it's best to take advantage and hopefully earn a few boosters (without being too greedy) as soon as it's available again (after the 24-hour cooldown), as it's not guaranteed to be there later on. In any case, nothing ventured, nothing gained. ☺