Your kahsha: Based on the Rashbam the shulchan orach doesnt let us invite people to brisim, what about a wedding kohen to a koheness ? Rabbi Jacob B. Mendelson's hunch – the gamara means only kohanim meyuchasin.(Rabbi Baurch Pesach Mendelsons father)

<p class="MsoNormal" style="text-align: left; line-height: normal; margin: 0in -26.2pt 10pt 0in;" align="left"><span style="color: black; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-fareast-language: EN-GB;" lang="EN-GB"><span style="font-size: small;"><span style="font-family: Times New Roman;">According to Rav Moshe Feinstein (Igros Moshe, Orach Chaim, volume1, responsum 41) one can have mixed seating at a wedding since people are there by invitation. However for a bris milah, one specifically does not &ldquo;invite&rdquo; people, but one just &ldquo;informs&rdquo; them. Will this affect the seating arrangements?!</span></span></span></p>