The boys lacrosse postseason is picking up in the Baltimore-DMV region as Bullis School (Md.) remains the No. 1 team in the High School On SI Baltimore-DMV Top 25. The Potomac School (Md.) school is set to host 20th-ranked Saint Albans School (D.C.) in the Interstate Athletic Conference (IAC) semifinals Tuesday. The winner will play No. 5 Georgetown Prep (Md.) or defending champ and No. 6 Landon School (Md.) in the title game Friday at the highest seed school.  Georgetown Prep, which defeated Landon in the regular season finale last week, host Landon in the other semifinal Tuesday. The Maryland Interscholastic Athletic Association (MIAA) A Conference postseason will start Friday with two quarterfinal matches. Defending champ and No. 2 Calvert Hall College, No. 3 McDonogh School, No. 4 Archbishop Spalding, No. 7 Loyola Blakefield, No. 8 Saint Mary’s (Md.) and No. 9 Severn School (Md.) will make up the six-team field.…