The phrase "at two seminars" is correct and usable in written English.
You can use it when referring to participation or attendance at two specific seminars.
Example: "I had the opportunity to present my research findings at two seminars this year."
Alternatives: "during two workshops" or "at a pair of conferences".
At one seminar, participants were told they would get to have their pictures taken with Mr. Trump; it ended up being with a cardboard cutout.
At one seminar, he later recalled, "I criticized all those who had concluded that markets were random, including most of the professors in the room, as being too heavy-handed in their testing methods to uncover the structure of price variations.
These included trainer and learner time, including time online, as well as materials, travel, etc. Training involved two seminars at each intervention practice attended by one general practitioner and one practice nurse, two rounds of simulated consultations with feedback from a facilitator and a web based e-learning programme and forum.
This spring, Mr. Vejvoda's foundation and the media association sponsored two seminars looking at South Africa and Latin America, but they were not well advertised or attended.
At two morning seminars, an afternoon gala awards presentation in the dazzling Guangzhou Opera House and an evening banquet, prizewinners and celebrities spoke of their China Dream and their longings for truth, morality and greater rights.
Two seminars and panel discussions are free.
It involves sending staff members to at least three seminars sponsored by the L.A. tourism board.
This selection was made because in order to receive credits for this course it is mandatory to attend at least three seminars.
In fact we have been asked for this control upon presenting our results in at least three seminars, and hence would like to keep it in the paper.
People's lives were saved because the security guard had a gun, said Chinn, who will speak at eight other seminars scheduled at religious institutions around the country in coming months.
