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Topaz stops generating during calendar events, you have to increase your max topaz (via cards or bank investment) and make sure your topaz is full before the event starts to get the most out of them. The upgrades bought by topaz during the events are strong but not equal so make sure you understand what you're actually doing before buying all you can, I made that mistake last year then got stuck in an entirely avoidable grind. For the summer event it does seem that the land is the best thing to buy with it, the build queue and speed are not worth it and while the material gain might be, I have no idea what stack capacity is so idk, you decide!