Explanation

Evoke — to summon — is justified by the text. Convoke — to call a meeting to order — is not quite appropriate (maybe if there were multiple spirits — also a problem with coalesced). Elicit also has the wrong spin; it is more frequently used in the sense of eliciting information or opinions.

Evoked.
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If the participants of two minds and everyone felt "the presence of something new", shouldn't the first blank denote something opposite of actually calling out a spirit BECAUSE the participants were of two minds?

Kinda weird question, awkward

If you do not grasp the meaning could be tricky

The sentence:

After the end, the medium (the person who stands between you and the other world (the world of death usually or the aliens who knows ------stupid stuff like that in my personal opinion) put the participants in a strange position.

Conversely, the people who participated in the aggregation, ceremony or whatever....they were unsure of what happened - that is the meaning of two minds

The medium evoked a spirit but part of people was skeptical and part not. However, all of them , regardless of they believe or not, felt something in the room. What ?' We do not know

The key point is: the medium - or falsely or truthfully - evoked something in the room

Hope this helps