Raaban, Sanhedrin page 5, "two who declare themselves experts”

If two litigants are in obstinate disagreement with respect to [the venue in] a lawsuit, and one [the debtor] says: “Let us be tried here;” and the other [the creditor] says: Let us go to the place of Assembly [maintaining that he lacked confidence in the local court and feared an erroneous decision] (B San 31b) to enslave debtors to their creditor. But, if the creditor says, “let us be tried here in this city” then hold the trial there in that city. This is as Rabbi Eliezer said, If the creditor claims a maneh from the debtor, must the debtor spend another maneh [in traveling expenses] on top of the first? Nay, the creditor is compelled to attend the local court. B. San 31b) This is the halachah. And in Baba Kama they explain this in the book at the end [of the tractate] (112) . Presently, the custom is that even if it is the debtor who says, “We go to court here,” then [the creditor] obliges. It seems to me that presently, because there is no established place for a debtor’s court as there once was, yet there is an established yeshiva in another place, like it is taught (San 32b) “‘Justice, justice you shall pursue’, go after a the wise sages to a yeshiva, after Rabbi Eliezer to Lod, after Rabaaz to Baror Chayil (San 32b).” [Translation by Rabbi Rachael Bregman. Edited for gender neutrality]