Events happen whenever GMs will it for daily events XD; so hard to say for population during those type of events.
Planned events such as Trial of Heroes or other pre-dated events and WoE, our population is steady at 130 and a bit higher too.
Small community has its plus. Some prefer bigger communities while some likes heRO because it's small enough to know almost everyone. Really up to you if it's a "good" or "bad" thing about our population ^_^;